i like all the ideas about dealin with em n the 3d to 2d and Ad is a class idea, ill start using that alot now.
I'm 14 and performing in front of a large group of people means youll get about 3 hecklers who think they know how to do the trick.
I like to do paper balls over the head to one of the hecklers which means everyones laughing at them cuz they completely missed it flying over em. Then finish off with darwins sucker vanish (using the thumbtip and a tissue) and just say when it goes, "and thats for all you suckers who thinks they know how to do my tricks!!!"
Big laughs, and a big round of applause, this should shut at least one of the hecklers up
*idea from greg wilsons 'on the spot' DVD and Darwins 'encyclopedia of thumbtip tricks(3 DVD set)*
And if you have confidence in the calssic force or a force like the hindu shuffle, force a card on a heckler eg. 3c and have a spare 3c in your pocket, when you say "show it round to everyone, just slide the extra card out your pocket (just the pips) and just wait till the heckler notices the card

, again big laughs towards the heckler.
*idea from Paul Greens 'The Classic Force' DVD*