Amazing trick. Well taught instructional video. Easy to learn, and gets great reactions. Many
variations are taught as well. I can't think of a single negative thing to say about it. Some people
might be put off by the fact that how to do this in say a magic show is not made fully explicit.
However if you are listening carefully this is actually explained. In a magic show you have the
balloon out of sight and prepared. Only one move remains. With enough practice you can do this move
almost instantly as you reach for the balloon. Now you are fully ready and all you need is a sponge
ball.