You might be interested in YesButNoButYes: Going during a movie.
"RunPee.com reviews movies for the specific purpose of giving you the 'all clear' when it's okay to hit head. Like the above review for Star Trek. A movie I finally plan to see this weekend. According to runpee, about 50 minutes in to the movie you'll have a good 3 minutes to go relieve yourself without missing much Star Fleet action."
