It's funny, I went to school with a guy who had a fake leg. Once in class in year 8 we had a substitute teacher who didn't know about his leg. Due to the artificial joint for the knee and this being the late 90s before these new fangled fake legs, there was a hole in his school pants at his knee where it'd catch.
So of course he pretended to fall over in class, stuck some scissors sticking out of his knee and the substitute teachers face drained with blood.
Pranks must be something with these guys! haha
Also god dammit, someone with out a leg and they are much fitter and in better shape than me, for some reason that is not inspiring but depressing.