Nothing to do with a pool game, but it happened in a pool hall where I worked as a kid.
There was a real old guy called Hack who used to stop in and maybe have a beer and play a game of snooker every once in a while.
He was a truck driver and always wore a trucker cap.
He was bald on top and he never took his cap off. I don't think it was because he was ashamed of being bald, I think that is just the way he was.
He had one front tooth on top and it was loose and he would reach up and wiggle it sometimes and then start laughing like hell which would make everyone else laugh.
One day, he was playing snooker and some young guy was joking around with him and said, "Hack, I've known you for years and I have never seen you with your cap off. If I ever see you lay it down, I am going to shit in it."
Hack looked up and smiled with his one tooth prominently showing and said, "Boy, I'll tell you what. You may shit in my cap, but if you ever do, the undertaker will wipe your ass."
Everybody in the pool hall, including Hack, died laughing.