There's a website that lists current and classic movies, with suggested times that it's safe to run to the bathroom. You even get a synopsis of what's going to happen while you're away, but it's scrambled so as not to be a spoiler. I guess you could take your iPod Touch into the bathroom, hope for wifi, then look up the missed content on your way back to the theatre.
Check it out for sure.
question: do you ever run to the bathroom during a movie?
mompoet - big water drinker, frequent emptier