53
What's that my martial friend? Through the door you say, which you'll then block? You know just what to tell me.
(lemmy.world)
Bonus points for having an athletic friend hold the door closed afterwards until the screaming stops.
I'd think of it as once to set up Chekhov's gun, and once to use it. I think that's a good rule, but it should be clarified in session zero.
Also, if anything depends on the environment, you don't need rules like this and you can directly control it to make sure it doesn't happen often enough to get boring.