As we grow older, we find that we are less likely to be able to drink a soda and make it through a long movie. When is the best time to go? Generally, we have to guess. With an iPhone or iPod Touch and a new app, the guesswork may be over. It’s called RunPee Mobile (seriously). For a mere $0.99 it tells you at which points in a movie you can safely “run” and “pee” without missing a hugely important plot point. The creators already had a web site call RunPee.com (same folks), but this is much more convenient,