There is one thing I do that will shut the heckler up, the Aduience may get a little aggrivated but everyone laughed when I pulled it the first time.
I am like, " Hey you like attention? Good I need an assistent for this one ".. I wait a few seconds then start dealing cards one by one with him in front of me, and I play it up " This one is really hard, but Really cool!" and patter on then on the last card square up the deck give them a real a glare and put the cards in there case and say " I dont like you enough to do the trick, you were a great help at reversing my deck though!" Then proceede on to a card trick with another person...
*WARNING!*; he left the building with his face red and eyes tearing from everyone laughing at him.
One liners;
If some one snatches at your hand, " Um, I am not like that. thats cool if you are hey nothing against it but please dude."
If a girl grabs your hand, Smile and take her hand ( drop the coin in a finger palm and take her hand hold it with your thumb where she wont try to do anything funny ) " Aww you wanted to hold my hand, hey wanna go out for coffee later? " ( takeing her hand also kills suspicion about the coin being there from the other spectators.
If some one snatches a trick casually reach over whisper loud enough for the room to here, " There is therapy for that, People go there for being kleptos not so diffrent from your self"
and if some one forces a trick from you;
" If you wanna know it that bad give it to me I will show you" When he gives it quickly pocket it wink at him and say " Never trust a magician "
If some one is giving you a hard time take gold coin ( specialy for the girls the hate it ) and preform a coin switch asking one of them to hold it, then drop a half dollar or a sentavo in there hands pull the gold from one of there shirts smile and ask " You really did not think I was ganna let you have a gold coin after you -what ever the done-" That makes the sooooo angry it is funny!
I am 13, living in a small town in alabama witha bunch of know it alls,
I JUST recently have found a magic shop in dothan, so I really have focused on my Coin/Card magic and my patter because I dont have to many gimmicks

( I dont much like gimmicks I like the slight of hand ) I have used the magic rods/ coin squeez / scotch and soda / penny and dime/ and I use a stripper deck ( I carry the stripper deck for the smart mouths that kill my tricks, the always winde up with there foot in there mouth )
and as for the gold coin thing erm.. I use a St. Gauden 20$ piece ( replica ) the are fairly cheap 55-500.
My theory on gold which as been proven right by many spectators..
When some one sees silver the think " coin, whats the trick" Well when a person sees gold the think " What is that!?" and the start to think subconciusly about where the coin should be, therefor allowing the magic to have more of an effect because the forget that it is a trick and the start thinking like a child again and that adds magic effect.
Another thing to do with a gold coin use magicians wax, or clear tape and tape a small bag of gold glitter to your palm ( the one that is spose to take the coin in the french drop) Express that you are the strongest man in the world -do the drop- and squeeze the bag with gold glitter, then after it pops throw it into the air the will watch the glitter not your hands pocket that hand to get read of the bag, all while catching some of the glitter, the express you are going to form it back into shape.
I act like it is not working I am just not magical enough then bring up "Magic in a young girls heart" and have the girl blow on my hand then reveal the coin. ( BIG reactions if done right )
an alternant verson is your take a bag of gold glitter, and you poor it into your hand (with your hand secretly palming the gold coin ) start talking about how you have practcied to be a conjuerer if the dont know what it is tell them about it... - with the coin covered with glitter turn to your side so the see a profile view, then blow the glitter out of your hand, leaving only the coin!
Sorry about all the confused typing should have done this tomarrow.. I will try to give better explanation on yahoo messenger... msg:
Insomniac1990 and I will try to get back with you soon as I can!