Seriously, the worst one I heard was this

Ronnie Lott, former safety for San Franciso 49ers. From Wikipedia:

"He cut the tip of his left pinky finger off after the 1985 season, when it was crushed tackling RB Timmy Newsome. He did so in order to continue playing football without risking further injury to the damaged finger. "

Posted By: Steve in Holland, Jun 3, 20:46:09