Rant: People who insist on bringing food and or drink into the opera house. Not much more annoying than having someone close to you crinkling wrappers., and I am not referring to the occasional cough drop wrapper. I have been at events where it sounds like some people are unpacking a whole lunch.
I've been to opera performances in Georgia (the country on the Black Sea, not the State), where people actually answer their mobile phones during performances and have full conversations!