You're sitting cozy in your velour chair at the movie theater watching Robert Downey Jr. take down baddies in Iron Man 3 when suddenly it hits you: "I need to pee." You instantly begin to wonder how much longer is left in the film, whether you'll be able to hold it to the end and if it's worth it. This is where RunPee comes in.

RunPee is an iOS app (also available on Android and as a Web app) that lets you know when the best time is to take a pee break during a particular movie. For example, if you're watching Michael Bay's latest and greatest, Pain & Gain, you can "runpee" 38 minutes into the movie for four minutes. Your cue is: "as soon as Victor is finished making all the calls that Lugo and the gang has forced him to make you hear, he says, 'All right, we're all  good here.' "

What happens in Pain & Gain while you're in the bathroom, you might ask? RunPee has you covered there too: "Paul is sitting in the warehouse reading a magazine. Victor yells over to him that he needs a drink. Paul replies, 'We don't keep spirits here, I'm sober.' Victor says, 'Me too.' At this point, Victor and Paul start talking with each other. Paul gives him a soda to drink and food to eat. Their conversation is revolving around sobriety."

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RunPee costs $0.99 in the iOS App Store, but if you're very frugal, you can check out everything it has to offer for free on RunPee.com. For a dollar though, RunPee is definitely one of the best paid iPhone apps around. We strongly recommend it for anyone that likes movies and hates holding it in.