Nothing more to be said. Try to make it your own and you'll be safe, even for those who seen it before or think they have.
I once came up with a funny variation using the 'Gecko', in which the spectator's selection appeared in a small pop bottle. I then said: "You know this is all fake right? There is no bottle", used the 'Gecko' on it, and was left with just their selection in between my hands. Just an idea you could play around with, and there are so many more things you could do with it.
But I agree, it s*cks. I often run into people who seen one or some magic tutorials on the web and just randomly guess that I do my tricks like that. It's annoying. You may want to have some outs to actually be able to show the same effect, yet done in a different way so you will decrease the chance of being heckled.