It's polite to be quiet in a theater.
Alex is watching a movie in a full theater that his sick friend did not get to come and see.
Alex wants to tell his friend as soon as possible about the movie.
Alex waits until the end of the movie to text his friend about it.
Alex keeps texting his friend and getting loud notifications of received messages during the movie.
Alex and the other movie goers enjoy an uninterrupted viewing experience.
Other patrons complain to the manager and Alex gets kicked out.