The movie theater experience
It can be so much fun. I remember attending the Midnight Special Preview of Batman (with Michael Keaton) at a large theater. While we were waiting for the ads to be over and the movie to begin, we all began singing the Batman Theme from the old Adam West series (duh duh duh duh duh duh duh duh) and at the end of that short reprise, about 300 voices in unison yelling out "BATMAN!" We were all still cracking up when the movie began, then dead silence.