In London, people seriously start eating Ben & Jerry's ice cream, but they do it during intermission and are usually done by the time the show starts again, although people with clinking ice in their drinks are pretty irritating.
I had been hating the giant Scottish man next to me who was singing along with various songs at My Fair Lady in London, but I began to love him just a bit when he turned around and barked at the kid with crinkly candy behind us, "What the hell do ya think you're doing?" It was rude, but effective, as the kid was terrified.
I just don't understand why people can't make it for two or three hours without bringing things that beep, crinkle, or make other distracting noises.
'"Contrairiwise," continued Tweedledee, "if it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic."'
~Lewis Carroll