This didn't happen to me, but it happened in one of my leagues in...eh, I think it was 1999 or 2000. Anyways...championship game and Team A was up on Team B by 30 points going into Monday Night Football.
All Team B had left was Marshall Faulk. Of course, this was a year when Marshall was playing like Priest Holmes in his prime. Well, 4 Marshall Faulk TD's later and some 150 combined yards and Team A was crying in their milk. Certainly our most memorable championship game ever.
We still talk about that game all the time because the guy who played against Faulk always gets screwed over by Faulk. Whenever he played Faulk he lost, whenever he drafted Faulk, he got hurt.