This site will tell you when it’s ok to get up from a movie to go pee, and what you missed while you were gone. I have only ever gotten up to pee during a film once and I felt horrible about it. On one occasion that I needed to pee, I’m pretty sure I incured an actual injury from holding in a needed pee for such a long time. This site might be helpful if I fear I may ever find myself in that situation again, though I hope it never will be needed. I still feel the movie theatre is a sacred place and it is only the weak and sacrilege who would get up without first having great hesitation and post-pee regret.