My mate came out with a cracker the other week. We were at the Police concert at Twickenham, yabbering away and enjoying the gig - you know loud music, few beers, singing along to the lyrics we knew, when some middle aged, suburban house wife type in her best home counties accent leans over and say's 'Excuse me, do you mind not talking - we're trying to listen to the concert'.
My mate replies, sharp as you like, 'Yes we do mind', turns back and keeps yacking.
She must have though she was there to see the London Philarmonic or something ...