This is slightly off the main topic but I once went to a talk given by Peter Hall at the NT, on ways of helping actors prepare for performing Shakespeare. Near me was an intolerable man of about 50 and his put-upon teenage daughter. As Hall recited a verse with rhythmic emphasis to explain pentameter, the man nodded his head in time to the beats, eyes closed and with a little smile, augmented by vigorous nods of affirmation (eyes still closed) as Hall gave his explanation. It might sound quite innocent but it was infuriating. I'm sure most here can picture it and shudder. Hall recited a verse and said it was the opeing lines of Merchant. The man nodded, leaned in to his poor daughter and loudly whispered "Yes, that is correct". Very helpful of him, perhaps he should've proclaimed it to Hall and thus assured him he had identified the quotation correctly.
This went on throughout the session but I'd tuned him out. It was bad enough at a platform, but has anyone encountered this kind of thing during an actual performance?
(PS - yay! Ton up on the bad behaviour thread).