All the above, plus:
Try to remove a branch from front wheel during a descent in a cross race. Ouch.
Ride a fixed wheel bike wearing baggy jeans, not tucked into sock or rolled up. Cue one legged jeans and messed up face.
Clip into spd backwards whilst chatting at the top of a hill. Had to rip the fecker off and ride cleat-less.
Attempt very large drop-off outside Navigation in Buxworth after quite a few pints. Cue broken XT bb and large scar in back of leg.
Oh well, you live and, in my case, don't learn!