Ha! I try not to take too much risk for a shot but it can be hard to resist sometimes, especially if things are happening fast.
I've lost some skin, bruised ribs, and broken a couple of lens hoods and introduced a rough spot in the zoom motion of a lens by trying too hard to get the shot. But when you get that shot it's pretty glorious!
I had a clean run as a MOTO PHOTO guy (shooting from the back of a motorcycle) with a big bike race through the mountains (USA Pro Challenge) last year but then earlier this summer I crashed into my own camera trying to be my own mountain bike model. Actually I'm pretty glad the crash was there and not in that race!