I was just reading an article in one of the G2 supplements from a few weeks back where they asked readers to write in the best comebacks/heckles they had ever heard at shows. The three highlights for me where
Bono asks for a moment of silence at a Glasgow U2 gig
Bono: Do you know......that everytime I clap my hands.......a child in Africa dies?
Audience member: Then stop f*cking clapping them
or
A stage performance of Anne Frank in London's West End was so poor that when the Nazis burst into the house an audience member shouted out
'She's hiding upstairs'
or
At a Frank Skinner show in Leeds. Frank is in the middle of telling a joke when an audience members phone goes off and he answers it
Frank: So who is it?
Audience member: A better f*cking comedian
Genius