Richard Durrant used to run a monthly 'open mic' at the Airport and latterly the Ropetackle in Shoreham (near Brighton, UK). It was only an 'open mic' in the sense that you got invited to play in front of a paying audience, but it was always great fun.

One of his party tricks was to project a video of himself playing guitar on a large screen on one wall of the stage. The piece would then repeat with him playing along live to himself - amazing counterpoints and harmonies. The joke was that, when it had finished, the videod Richard would say to the live Richard, "Hey - that was fun - shall we do another one?". Which was always good for a laugh.

The point of this (for me)? No rules. None whatsoever. Do what you like, and pay the devil.