A layman once asked me: "If you're a real magician, I want you to stick your whole hand through your head, right here, in front of us all." Unfortunately, I didn't have the required gimmick.
Another time, a mean layman who knew just enough about magic to be dangerous asked: "If you're such a good magician, why don't you just hold your hand palm up and pull that scarf out of your hand that way?"
Once, a guy came into a bar where I was working and said: "Twenty-five years ago, I saw a magician who took a penny, stuck it into his fist, and when it came out the bottom, it was a dime. That was the greatest trick I ever saw."
So I quickly set the trick up with a palmed dime and a thumbtip and duplicated the trick. And there wasn't a whole lot of praise for me; he just kept raving about the guy 25 years ago. I think some people are in love with their memories. And now, 15 years later, he's probably raving about me, too.
Last night, while shooting my new DVD, I performed a trick where the spectator secretly wishes for something, and then later in the set, I tell her what she was wishing for. In this case, the 18-year-old girl was wishing for a new car. After we stopped shooting, she said: "Now if you can only make that car appear." Again, I didn't have the required gimmick on me. ;)