My slam-fire experience
As a young teen many years ago, I was loading up an old Ruby .32 auto a relative brought back from The Big One. Bad news is, I was loading it inside to "make sure it was ready" for us to go shoot it. (OK, overeager with new toy.) Good news is, at least I was pointing it in a safe direction AND it failed to feed the first round, at which point I said, "Self, you'd better take this outside." I did, then got it to load one from the magazine, at which point "POW!" into the ground. I don't remember if it had only one in the mag or if it jammed, but I presume it would have been a full-auto experience otherwise.
Later I got a good look at the old German holster that came with the gun. . .and there was a hole in the bottom, right where the muzzle would point when the pistol was holstered!
Lucky for me, my Dad had emphasized in NO UNCERTAIN TERMS that I was never to point a muzzle at anybody I didn't intend to shoot, so that nobody would die if the gun's safety features malfunctioned. As he stated, guns are machines and machines malfunction. Humans are humans and we occasionally make mistakes. If you train yourself to use both "human" and mechanical safeties, nobody dies if you foul up or if the machine malfunctions. Good advice then, and still good now. I gave it to every soldier under my command--and many who weren't--in 24 years active duty.
Whenever I chamber a round since that old Ruby malfunctioned, the gun is pointed in a direction where nothing beyond a hole in wall/window will result if malfunction occurs. And although I "trust" & like a good auto pistol, I no longer have any & own only revolvers now. Primarily that has to do with many other reasons, but I do have that Ruby in the back of my mind & appreciate the relatively low-threat environment with revolvers.