A friend of mine, now a retired Deputy Sheriff, used to teach gun safety to Sheriff's department trainees. One night, unable to sleep, he got up and began "fooling around" with one of his guns, which he thought was not loaded.
He drilled a hole in the floor less than an inch from his foot.
I heard about the incident (he wanted to keep it hushed up) and the next time I saw him, I said, "So, Len, I hear you're gonna teach a gun-safety refresher pretty soon."
He did not look as if he appreciated the joke.
--Boris