I cant top the bolt story, but the other day I was welding a patch in a fender and I was holding it in place from behind with my other hand. So the very first spot weld I place is coincidentally right where my finder was pushing on the metal. I spot welded my freaking finger, it was instant 3rd degree and the skin was all gray... nasty. The good thing about it was that it didn't hurt, but took damn long tome to heal.