As a kid with a birthday between Christmas and New Year I would often be lured out of my seat and onto the stage to receive a sweetie proffered by a strange man dressed as woman. Some things never change.
Talking about audience participation, I found this lovely clip of Johnny Flynn (he of the Detectorists theme song) playing a little club in Toronto. When he announces that his next song is The Water (a duet he normally sings with Laura Marling), a rather brave young woman offers to sing it with him. 'You don't have to' Johnny tells her, probably dreading a car wreck about to unfold before him; he needn't have worried.
Johnny Flynn - The Water