I love the Heckler put downs,
But I did once experience the opposite when I went to see Chubby Brown in Preston many years ago.
I was sat near the front, and a lad not far from me got up to go to the toilet
(Apologies for the language next)
Chubby said to him "Where the fuck do you think your going you ugly twat"
And the lad turned to him quite calmly and said "I'm just gonna nip for a piss before the comedian comes on"
Not many heard it, but what a great laugh it got, and Chubby Brown shook his hand when he returned. Which I thought was really good sportsmanship from him