Ronnie Lott cut the tip off his and went back into a football game...just sayin;

edit for the "rest of the story" from ninersnation.com

The story that personifies Ronnie Lott is the amputated pinky finger. in 1985, during the season finale against Dallas, Lott collided with Cowboys RB Tim Newsome and crushed much of his left pinky finger. He came off the field but did get back on. Originally I thought the pinky was amputated right there on the sideline, but as Lott himself clarified, that happened in the offseason. In their first round playoff game the following week, Lott had his fingers taped up and played through the pain of the crushed finger. Either way, that's quite the bad-a$$.