Them: "I know how you did that"
You: *Gasp* "So do I!"
That sounds a bit condescending...
Ah well, if it works for you...
Usually i'll do something to make them think they know what's going on but usually they're wrong. For example, when i do a coin vanish, i'll say "I will blow on this coin and the con will disappear!". Then i pretend to secretly put the coin in my mouth and then i blow on my hand to show the coin's gone. Obviously the spectators think it's in my mouth, cuz i puff up my cheeks. Then i start to talk and then they're blown away. Then whenever they thin they know whats going on they may just think "Well i was wrong the last time, i'm probably wrong this time."
Sounds good. But I think the question was what to do when the spectator
genuinely knows what's happening. What do you do then? (I may check out the Street Cups trailer, though. The vanish of the coin in the mouth sounds nice).
Personally, I blow it off and work around it. I'll give you an example;
A spectator points out I've got two cards when I turn over their card in an Ambitious sequence.
I'll say "See, a lot of people think this. You're close, but so very far away from what I'm doing. See?"
Whilst I'm talking I'll second deal off the card, or something.
From then on, I'll only use techniques that actually bring the card to the top (e.g. no doubles).
I understand in some effects this is not possible, which is something I've never encountered. It'd be a difficult one to avoid I guess.
-Sam H