There is no reason to clap after a movie! Do you clap at home after you watched something you really liked!? I doubt it! The only time I could possibly think it would be appropriate to clap after a movie is if someone who was actually in the movie … is in the theater with you. Then, you’re letting them know that you enjoyed their performance … much like you do at a play … where there is a cast to receive your applause. There is nothing but a screen and projector receiving your applause at a movie. What the fuck are you doing? Is it a mating call for the lonely? A normal person will walk out of the theater and as they are walking back to their car talk about what they liked. Come on people!