I don’t get it when magicians are annoyed when people in the audience want to show them a magic trick. If I was guessing it comes down to an ego thing. When I’m doing roving close up magic, I always let them show me their trick. Sometimes you’ll be surprised at what they show you…usually it’s just the 21 card trick.
Occasionally I get to see this two card change:
However sometimes you get to see an amazing trick, this is probably what I’d consider the greatest trick I’ve ever had someone in the audience show me!
Letting someone from the audience have their moment makes you a generous performer. Now there are times where it’s inappropriate to have them do a trick, but in 95% of times when they offer there’s really no reason for you not to let them show you the trick aside from you being worried that someone will steal your spotlight.