When it comes to our adoration of sports stars, there's a thin line between cool and creepy.

This Dallas Mavericks fan is on the wrong side of that boundary.

At the Mavericks game against the Rockets this week, a man and his wife showed up with a sign that read as follows:

Maybe it's funny on first glance, but kind of weird when you think about it. This guy probably doesn't really wish Dirk was the father of his child.

Nowitzki, as it turns out, is a new father. His wife, Jessica Olsson, gave birth to the couple's daughter over the summer.

(H/T to For The Win)