It is a great gag. Whenever any spectator asks you any absurd questions in the middle of your routine, take out your counter and press it to have a record of the unnecessary comments. Later , if the comment comes up again, take out the counter again and show it explaining to the spectators that you have been counting all the unsuitable questions you have been asked during the day.
This hand counter is used by many magicians, among the Jon Allen ,from England.

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