Listen. For all you people who need a reply to hecklers here it is. When a heckler says"I know how you did that" they are putting you on the spot, Reverse it and put them on the spot. This is what you say"Oh finally, someone else who knows the trick." Hand them the stuff you are using and say "Show us your version of the trick." DO NOT be mean. DO NOT get mad. They will only embaress themselves by not being able to perform it. Act like you sincerely want to see their version of the trick. They are only mad because you can do something they can't. If you are on stage, bring THEM on stage in the spotlight and watch them get nervous as we do. Watch them doom themselves.