Yeah, I got two of those very familiar questions last night actually. I got "you have to do that again, please do it again" and "can i shuffle the cards?" I simply responded to the "please do that again" with: "you know what, I'll show you another trick that I've been working on, its pretty cool, I think you guys will like it" and just keep going. Its kind of like ignoring the question, but you are just moving along with the show (nobody said that anymore after that). to the "can I shuffle the cards?" I just said: "its going to cost you extra" the lady actually said "whatever it takes" and to that, another audience member came up to defend me and said "hey, let him do the magic, you may take the magic away from the cards" Which I thought was awesome. The lady did not say anything any more, and this was after I did a series of tricks.