The lights dim, the movie starts and you're relaxed. All of a sudden people behind you start to talk and you are no longer relaxed, but angry and tense.
When going to the movies, one expects to see and hear the movie. It is a chance to escape reality and let go. Instead you get distractions and annoyances that ruin good movies.
Common courtesy at the movies used to be expected, yet in today's world it seems courtesy is dead.