Surprised no one has mentioned all the good/great players and gamblers that would punish themselves when playing bad.
Louie Roberts used to hit himself in the head with a cue and he would run head first into a wall.
Fabio Petroni would smash his head into the rail of a pool table.
Joe Lawrence (Canada) would go in the bathroom and yell at himself in the mirror and punch himself. He’d punch himself hard too.
A guy in West Virginia (gambler in everyones book) would kick the pool table like he was punting it. Sometimes with no shoes on.
So many others did all these things and more.
The worst would have to be"Crazy Bruce". If you never personaly saw him you would not believe he was real. If you knew him and saw his act it was hard to believe.
I would have thought it was not possible to knock yourself out with your own fist, it is.
What's funny is, he could play, he almost never lost. But if anything went wrong though it would set him off. When he played the pool room would be packed just waiting to see what he may do and he never disappointed.
Now years later in retrospect, I know it was not funny, he was sick.