A husband-and-wife duo we used to go to see a lot had a thing they would do for their own satisfaction, rather than the audience's, when they were playing a bar gig in a noisy bar, where only a handful of us sitting right up front were listening. At the end of the evening, as they closed up, the lady would smile radiantly at the audience, and say, very warmly, "F*** you, f*** you very much!"

No one whom it was intended for ever noticed.

Peter.