When someone says something so outrageous and unbelievable, one may say "Are you out of your tree?" which means that the person is out of their mind on such an idea. The phrase originates from the popularNintendogame, Animal Crossing.
Tanner: So what are you trying to do here?
Reil: I'm going to jump that shark tank on this here bike.
Tanner: Oh no, no, no! Are you out of your tree?! You can't hope to jump something like that on that thing. You may as well start jumping turtles before doing something so unbelievable.
When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.