When I was watching Bolshoy's D.Q. in Chicago flash cameras were going off constantly - it was very annoying.
A man was so much into the music that he was injoying it by steping the beat with his foot.
When the peformance was over and the dancers and choreographers came on the stage to bow, some of the viewers desided to skip the duty of giving the gratitude to the people who for 3 hours gave them theirs talents, strength, and sole. That was unspeakably rude.