I have a funny one.  Although it did not happen to me, my father, witch i am not sure i should admit that.  He was reloading some 44-40 rounds when as he was seating a primer, it flipped and went in backwards.  We instead of spending the extra minute to just put the depriming die in and knock the primer out, he used a hammer and punch.  A few taps of the hammer on the punch, you guessed it, it went off in the palm of his hand.  He said it felt like someone smashed his hand with a sledge hammer.