And you thought Mike Tyson had some loose marbles rolling around upstairs.
Meet Luis Suarez, who goes him one better.
Suarez, a star for Liverpool in the Barclays Premier League in England, is at once perhaps the best player in the league, and ... well, kind of a psycho. Just recently, for instance, he was fined for biting an opponent on the arm.
It wasn't the first time he's done it.
While Tyson only munched once on Evander Holyfield's ear, Suarez is a serial gourmand: He also bit an opponent while playing for Ajax in 2010 and was suspended for seven games.
No word on whether the Premier League will require him to be fitted for a muzzle from here on out.