If Darnell Dockett had suited up for Sunday's game between the Arizona Cardinals and the Oakland Raiders, he would have gotten a 15-yard penalty for taunting.

Instead the injured defensive end was on the sidelines, and he decided to use his down time to troll the fans in the stands behind him.

As it became clear that his Cardinals would beat the Raiders and drop Oakland to 0-6, Dockett scribbled a stinging message on a whiteboard and showed it to fans:

After the game, Dockett explained his actions on Twitter (note: he uses an expletive in his first tweet):

Dockett told ESPN that after he held up the sign, more objects were thrown his way by the notoriously rowdy Raiders fans.

Raiders fans join a long list of people and groups that Dockett has taunted, including Cincinnati Bengals backup quarterback A.J. McCarron, Chicago Bears quarterback Jay Cutler and PETA.

While Dockett was placed on injured reserve after tearing his ACL at practice in August, the Cardinals are off to one of their best starts in recent memory. After beating Oakland, Arizona is 5-1 and all alone in first place in the NFC West.

With the Jacksonville Jaguars' victory over the Cleveland Browns, the Raiders are now the only winless team in the NFL.

"Justin Bieber is tough, for real. What, you don't believe him? You want to fight about it?"

Maybe that's the train of thought that led Bieber to seek out boxing lessons from Floyd Mayweather. The singer's winning combination of polarizing celebrity and escalating legal trouble would seem to increase his odds of finding himself in fisticuffs, and exercise is a great way to de-scrawny a body.

What's less clear is why Mayweather, a five-division world champion and undefeated as a professional boxer, would want to teach Bieber how to swing his fists at people who make him mad.

But the two apparently have a years-long friendship -- or something like that -- during which the pop star has sat ringside at Mayweather fights on several occasions.

All of this to say that some questions don't have answers. Nevertheless, there's video proof that the Mayweather-Bieber training sesh happened:

Sure, Bieber, you can swivel your shoulders real nice and flex those tatted biceps. But how well do you take a fist to the face?

That's a video we'd like to see.

Bill Belichick was once Bill Parcells' chosen successor. They went six years without speaking.

So what happened? Bill Parcells is ready to tell all.

In a new autobiography titled Parcells, the Hall of Fame coach reveals that Belichick betrayed him in the late 1990s. According to Parcells, the pair had an agreement in place in which Belichick would take over as coach of the New York Jets once then-head coach Parcells retired.

Only two days later, Parcells received a resignation letter from Belichick, who had just accepted the head coaching job in New England.

At the same press conference where he was intended to announce his new future with the Jets, Belichick instead announced he was leaving. Parcells took it badly, and the two avoided each other until resolving their differences in 2006.

"He made a deal and then tried to get out of it," Parcells writes. "A deal's a deal. You want out? You're going to pay. Simple."

Allegedly, Belichick turned down the Jets job because the team's ownership situation was unclear at the time, and that created insecurity about his future with the team. That decision has fueled an intense rivalry between the Jets and Patriots over the years, with Belichick getting most of the laughs.

In his book, Parcells says the two have since moved past their differences and are back on speaking terms. The coach even says he doesn't "begrudge" Belichick for going to New England.

But Parcells, who led the Patriots to the Super Bowl after the 1995 season, does credit himself as the likely reason the Patriots hired him in the first place.

In other words, Belichick would be nothing without Parcells. Yep, sounds like everything's hunky-dory now.

Before the secretly recorded tapes found their way to the public, Blake Griffin had his doubts about Donald Sterling. In a column penned for The Players' Tribune, Griffin talks about his uncomfortable relationship with the former Clippers owner, including how Sterling sometimes treated Griffin like a novelty.

Griffin describes how, at Sterling's annual White Party in Malibu in 2009, Sterling led Griffin around to all the party guests, holding his hand and introducing the young star to the billionaire's friends.

Griffin says that Sterling would engage in a question-and-answer to demonstrate to his friends how a young kid from Oklahoma was adjusting to life in Los Angeles.

"At one point, a guy who had clearly been to a bunch of these parties turned to me and said, 'Just keep smiling, man. It’ll all be over soon,'" Griffin writes.

Griffin says that when the tapes came out documenting Sterling's racist comments toward black people at Clippers games -- even criticizing Magic Johnson -- the Clippers star was shocked, but not surprised.

The forward also insists that when the team did proceed to play in last year's NBA playoffs, they did so for themselves and their fans -- not for Sterling's benefit.

"For people to ever think we were playing for Donald Sterling is comical," he writes.

While his characterization of Sterling is that of a "weird uncle," Griffin sounds happy with new owner Steve Ballmer, who he describes as a "cool dad"-type that wants to win at all costs.

As for Sterling, Griffin wasn't exactly happy to see him walk away with $2 billion. But he also recognizes that with the Clippers taken away and his reputation tarnished, money is about all Sterling has left.

In 2003, Eric Kester was a 17-year-old ballboy for the Chicago Bears. The aftershocks of the violence he saw during that season are still rippling through today's NFL.

In a column published in The New York Times, Kester talks about the extreme violence he saw occur on every game day, which resulted in many players sitting around in postgame locker rooms with dazed expressions from the damage inflicted.

In particular, Kester is troubled by the role he suspects he played in causing irreparable brain damage to those players. While today the football world knows about a condition called chronic traumatic encephalopathy, or CTE, Kester understood at the time as a momentary problem remedied by smelling salts.

One of Kester's responsibilities was to carry small amounts of smelling salts in his pockets on NFL sidelines waiting for players dazed from a hit. When a player would call him over -- many times after vomiting from a hard hit he had just taken -- Kester would quickly pull out the salts for the player to inhale.

The salts snapped the player back to an alert state, and he went on playing the game.

Kester argues that TV cameras were instructed not to show the smelling salts on broadcasts. But those aren't the only signs of damage Kester saw as a ball boy. He routinely found bloody and soiled jockstraps that he ascribes to a brief nervous system failure caused by a hard hit.

Kester also describes having to unwrap a wad of gum because a player lacked the fine motor skills to handle the tiny foil himself.

In the editorial, Kester calls for better mental health resources for players, as well as larger NFL reforms to save the league before injuries destroy it.

The way Kester sees it, much of the off-field trouble caused by NFL players -- particularly regarding alcohol abuse and violence -- are inextricably related to what those players endure on the gridiron.

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Paul Pierce put his Boston-area mansion up for sale almost one year ago. He's still waiting on a buyer.

The five-bedroom, five-bath home features more than 7,600 feet of finished space, but no one has been willing to pay the list price of almost $2.5 million. It's a common story in the Boston area, where athletes routinely struggle to sell their oversized mansions.

Former Red Sox outfielder Carl Crawford is a cautionary tale of buying too big. After being traded to the Los Angeles Dodgers, Crawford listed his home for $3.2 million. But he wound up selling for $2.6 million, a drop of $600,000.

According to a Boston.com report, part of these struggles has to do with the buying tendencies of athletes moving around the country. Major assets like luxury homes are tough to sell on short notice. Yet players may be traded or choose to sign with another team, forcing them to put their house on the market.

Due to the small pool of buyers, it's rare for those homes to be purchased quickly. And whereas other buyers make real estate investments hoping to buy low and sell at the peak, athletes are often buying homes as a necessity, then selling when they no longer need them.

Pierce's former teammate, Kevin Garnett, wound up taking an $800,000 hit when he sold his Boston home in 2013. There are happy endings to some of these stories -- Jon Lester made $500,000 over his purchase price when he sold his Boston-area home earlier this month -- but this can be a product of market conditions more than smart investing.

The point, of course, is that if you're moving to Boston on a massive sports contract, it might be wiser to rent. Or at least consider a more humble abode.

Barret Robbins is best-known to the football world as the Oakland Raider who went missing the day before Super Bowl XXXVII.

It turned out Robbins had disappeared after a night of heavy partying in Tijuana.

But Robbins' turmoil didn't end there. He dropped out of the football world and re-appeared in news headlines three years later, when a violent altercation with police in Miami resulted in Robbins being shot three times by law enforcement.

After that incident, Robbins went to jail. Upon his release in 2012 he angrily refused comment to various media outlets. Then, again, he disappeared.

Two years later, Robbins has surfaced in the Bay Area. He understands some of the plights that have plagued him for years, including bipolar disorder and alcoholism. Perhaps most importantly, Robbins discovered he is likely suffering from post-concussion symptoms -- problems that wouldn't have been identified during his playing days.

According to the Bay Area News Group, that discovery has been critical to Robbins' rehabilitation. The former Pro Bowler has been out of his most recent rehab program for three months, and he says the focus on his mental health problems -- which hadn't been addressed in previous visits to rehab -- has made all the difference.

"That's a part everyone was leaving out as far as I was concerned," Robbins told reporter Jerry McDonald. "I'm already bipolar. I have to take medications. So even if I'm doing that and staying sober, I still have to deal with issues mentally."

In his nine-year NFL career, plus high school and college, Robbins estimates he suffered at least 10 concussions. But Robbins pointed to the prevailing mentality he was taught: When you're hit hard, you go back out and do it again.

Now, the NFL veteran is living with the consequences, which means taking his recovery one day at a time. After just a few months out of rehab, Robbins hasn't decided where his future is headed. He has two daughters in Los Angeles and is currently living with a friend in the Bay Area.

He recently volunteered at a Special Olympics event and said he plans to reach out to some ex-teammates from the Raiders, whom he has avoided since leaving football.

Now that he is free of legal troubles and understands the conditions that afflict him, Robbins believes he can make positive contributions in whatever career he decides to pursue.

See Slideshow >>

You know someone looks like Aaron Rodgers when even residents of Green Bay can't tell the two apart.

British comedian Tom Wrigglesworth bears an uncanny resemblance to the Packers' star quarterback. It is so strong that on a recent trip to Green Bay, residents thought it was actually Rodgers they were seeing.

Here's a look at the comedian and the QB side-by-side:

And here's the video that Wrigglesworth posted to his YouTube account. As you can see, it's not just the residents of Green Bay who can't get over the resemblance. Many of Rodgers' teammates are also stunned to see Wrigglesworth:

Nick Young has recently been in the unenviable position of fighting alone, so when his girlfriend Iggy Azalea was attacked by Snoop Dogg on social media, he quickly stepped to her side.

Seemingly out of nowhere, Snoop Dogg started taking shots at Azalea on his Instagram account with photos like these (the captions of which contain explicit content):

The "Fancy" rapper has responded with a flurry of tweets defending herself. Here are a few:

Young, who Kobe Bryant has said is "less successful" than Azalea, came to his girlfriend's defense:

Citing player safety concerns, a Michigan high school football team has cancelled its season with three regular-season games left.

Caro High School has been devastated by injuries. According to its head coach, four or five players have suffered season-ending injuries, and several more have sustained concussions. At the same time, four players quit the team in the past two weeks, depleting its pool of healthy bodies -- particularly among the juniors and seniors.

That has forced the program to promote sophomores onto the varsity squad. But Superintendent Mike Joslyn said that action only increased the risk for additional injuries. The sophomores were not physically or emotionally ready to take on other varsity players. Eventually, the head coach's concerns brought him to Joslyn, and the school decided that the season should be cancelled.

The action is particularly relevant given the increased media attention focused on player safety in football. While some high schools have cancelled their varsity seasons due to a lack of available players, Caro has chosen to end the season when they could have pressed on. But that would have meant inserting overmatched players into dangerous circumstances.

Although some players were disappointed to see the season end, Caro's football team actually supported the move. In a team vote earlier in the week, two-thirds called for ending the season.

Joslyn told The New York Times that the decision was difficult, but that the school is "an educational institution, and with our student, safety comes first."

"These kids have long lives ahead of them, and we need to keep the brains in their heads intact," he added.

The move has been met with praise nationally. Steve Almond, author of Against Football and an advocate for dramatic football reform, chimed in:

Despite the rash of injuries, Caro High School does intend to play a full schedule next season. Joslyn personally feels that the issue of bodily harm in football has been sensationalized to some extent, but he does think some response is warranted, whether it means delaying the introduction of conduct among youths or taking other measures to improve player safety.

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