In defence of heckling!
A local performer was notorious for picking on members of the audience and giving them a hard time, bolstered by the fact that he had the mic and could shout down any opposition.
3 of us had had enough so we went to a gig of his, sat in the front row and gave him some stick for the entire first set.
During the break he said to us "If you leave me alone, lads I'll buy you a bottle of whisky"!
Offer accepted...