This trick is really good, the kids think they know how you did it and then they all got silent.
It's great if you have those hard to work with people who always says they know how you did the
trick. This will really get them quiet. On the other hand, if you are working close the audience
with small children they may see the secret after the show. Anyways, a good trick, I've performed it
many times and only got caught one time.