From the Gun side: I don't usually post stuff like this, but for my readers who live in a place where they can actuall go shooting firearms, here's something a dumbass did on the range the other day at work.
The items in the middle...some dumbass was able to chamber a .40 cal round in his .45. He pulled the trigger and hit the primer...which lit off the round and blew the case out. I guess the round bounced down the barrel towards the target....but I'm sure it wasn't very accurate.
The sad thing is, the guy was dumb enough the bring us the case and tell us what he did. If I did something that dumb, I would have not said a word.