Before just about every theater performance I attend there's an announcement about turning off cell phones and unwrapping candy in crinkly wrappers. (The latter always seems to evoke a chuckle for some reason.) Despite these appeals, however, about half the time I'm at a theater a cell phone distracts me. Make no mistake: This is rude and thoughtless behavior. It breaks the concentration of others in the audience, and it could distract a performer.