Where do I begin? The time a friend brought his brand new Colt Officer's Model to show me. I asked if a 7 round magazine would fit. To find out, I gave him the loaded one from my Gold Cup. It fit fine, just protruded a bit from the grip. As he pulled the slide back, I started to say "Is that a good i..." and bang, the round went through 4 walls and the sofa my wife had been sitting in a few seconds before.
The time a friend of mine, during deer season tossed his Winchester 94 in the back seat of my car. He forgot a round was chambered. Duct tape covered the hole nicely, and was even waterproof.
And my favorite. My uncle, on the way home from Christmas shopping kills a deer out of season. Because he was in a rush, he just throws what he thought was a dead doe in the trunk, along with the presents he had bought. Not being totally mindless, he covered the gifts up with a blanket. Yeah, you guessed it. It wasn't dead, and kicked the crap out of everything in the trunk. What wasn't destroyed by the deer was ruined by the blood after my uncle cut its throat with his pocket knife.