Just turn off your phone. Seriously. Not on silent. Off.
Are you a doctor on call? Are you eagerly awaiting news about your grandfather's estate? Do you carry the nuclear "football" and need to maintain constant connection in case of disastrous all-out global war? Then why the hell are you at the movies?
Yes, of course something important might happen during the two or so hours you're sitting in theoretical rapt silence, but if you really can't handle the thought of going without your texts for that long, you either shouldn't be at the movies, or you could probably stand disconnecting for a couple hours. The only reason you think you need to log on to Twitter or look up the actors on IMDb mid-scene is because you're afraid. You can do this. You can turn off your phone at the movies.
Oh, the light is distracting, too.