The worst one I can remember was jumping out of a tree (about 6 or 7 feet up) straight onto a 2 and a half inch nail poking out of a plank of wood. It went straight through my foot and hurt like hell. Lucky the blood didn't stain my socks, mainly because my socks were red

It's funny, even just typing about it now, my foot tingles where the nail went through, I guess it remembers