B.Y.O.S.S
A game rule that says you have to bring your own stat sheet or you will be yelled at, made fun of, and possibly turned into a vegetable.
Player: 'I brought my stat sheet… and my vegetable sandwich. I’m gonna need that.'
GM: 'I’m turning you into a vegetable because you forgot your stat sheet.'
Friend: 'I was turned into a vegetable. I still can’t talk about it.'