I'm in welding class and one of the auto mech teachers came over to use the torch. He was heating up some rivets to get a ball joint out some big ass lowers. All of a sudden BOOM, sounds like 12 gauge going off in the shop. I was in my welding booth so im thinking some crazy guy just came in starting to shoot. I walk out my booth and I see the mech teacher holding his hand with blood pouring out. Turns out he ball came out the casing and the snap ring exploded and went through his hand. Has this ever happened to anyone.