Annoying preps trying to get lucky. Seriously, throw a projectile at the bastard and yell-whisper: "Hey, jerk-off! Go piss to your girlfriend somewhere else and let the working class of America enjoy a couple hours of peace before I jam these 15" platforms up your [wagon]!" 'Twill get the job done. Believe it or not, I have thrown solid items at morons who user their phones while in a movie. And most of the time I do connect with their head. That gets the point across easily enough, and so does the "leave or turn your [bleep]ing phone off before i turn it off permanantly by throwing it into the wall" which is usually followed by applause from other people in the cinema :P