This is how I use to perform it:
Now I use the story from the prestige. "Magic consists of three parts. The first part is called the pledge. The magician shows you something ordinary....like a sharpie (draw an x on your hand). The second act is called the turn. The magician takes the ordinary and makes it do something extraordinary (make the x disappear). Now you're looking for the secret but of course you won't find it. Because of course you're not really looking, you don't really want to know. You want to be fooled. But don't clap yet because making something disappear isn't enough. You have to bring it back, that is why every magic act has a third part. The hardest part, the part we called the prestige." (snap fingers to reveal the x on their hand that was a closed fist)
If you do a dramatic presentation like that, they will forget all the dirty work.