Pull the plug.

Or better yet, get one of those timers controlling the power that work with a coin - put it right down the front of the stage, where everyone can see it, and mike it so that when the coin goes 'clunk' they all KNOW why the amps stop. If you are really cruel, you could hook it into the lights too... :-) That will work for the acoustic only guys - if you can't be seen, you can't be heard (Old Theatre Sage).

It will add to the atmosphere, and the audience will come to expect/enjoy it.


Some people only see problems as barriers to prevent progress, others see them as opportunities to be exploited.