What I hate is the drunks who think they are so funny that everyone must listen and laugh at their stupid jokes. I remember waiting for a movie to start on the SOS some years back and this one fellow was making a first class ass out of himself because he thought he was the life of the party.
Nobody has mentioned another reason I think for not taking flash pictures... it's annoying to the dancers and singers and probably putting them off balance. One of the reasons I love to cruise is the entertaiment and the shows and I love having good seats. No matter how many times they are told there are always little kids in the front rows...that bugs me... On a two week cruise there was fabulous entertainment and we joined up with other couples and we saved each other seats, but we check ahead of time to make sure they were going to the show..
The problem I've had was after the show started and most of the seats were filled some yahoo put his hands behind his head for the entire show. He was a large man anyway and we could not see over his fat head and elbows. After missing the first half of the show, We left and caught a later show.