by Jerome the French » Sep 21st, '10, 15:08
At the end of the day, this will happen, however you are prepared to counteract it.
Some people will always try to be cheeky / funny / clever / nasty, and this will happen. Wether you know you had their card or not, it is still your word against theirs...
And you need to be careful about how you handle the situation... you could turn your audience against you.
Most people don't do it to be nasty (most of the time), I think your only option is to bow down and say you screwed up... they will then own up most of the time... At that point, I just joke saying "don't do this to a magician, you're gonna give him a heart attack or something"... That usually gets a laugh, and all is forgotten, move on with the show, and they won't do it again...
Etienne Pradier usually says "oh, you're a liar... like me!"
that was my crappy advice.