Mike Tyson

Mike Tyson is 50 now, and while his life has seen its highs and lows, his performances in the boxing ring almost never disappointed.

Love him or hate him, Tyson was a machine -- a fighter to be feared, and perhaps the greatest boxer since Muhammad Ali.

If you've forgotten that, check out this crazy video documenting all 44 of his professional heavyweight knockouts. At 21 minutes, it's not a quick view, but this series of dominating finishes is stunning nonetheless.

Boxing is an inherently violent sport, but it always looks little more ruthless when Tyson is the one throwing the punches.

Happy birthday, Mike.

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