As for the Topic of the Day...
Hmmm...
I'd like to research and write up a history of the audiences for musical theatre and opera and the other performing arts over the past 100 years. I wouldn't want some sort of dry, sociological study, but rather a compilation of sorts of "bad" - and "good" - audience behavior. A collection of "Yes, they really did that!" incidents.
Yes, cellphones are quite the nuisance today, but, remember, people used to bring rotten food to the theatre to throw at the stage.