From the classic b3ta thread on heckles.

http://www.b3ta.com/questions/heckles/

"A mate of mine worked for a company who specialised in stage rigging, one of his main jobs was looking after the aerial safety on the Gladiators TV show. In between series of the programme he was sent to work at a holiday camp for Keith Harris (and Orville.)

Harris’ act was supposed to start with him on stage talking to an unseen Orville. The green duck would be whinging about not being able to fly and would launch into the madly annoying ‘I wish I could fly’ song which plagued the charts in the 80’s. At the climax Orville would be released from the back of the auditorium on a wire and would ‘fly’ over the kids heads to join Harris on stage.

The job was easy money but Harris turned out to be a complete and utter twat who pissed of everyone who had to work with him. My mate decided to take revenge and one night packed Orville full of stage explosives and a detonator. Half way down the wire cue a loud bang, a shower of green feathers, a room full of traumatised kids and an apoplectic Keith Harris.
2
My mate got fired on the spot, it was well worth it.