And this is corn starch and water on a speaker (protected with plastic wrap):
http://www.youtube.com/watch?v=SbTHExJzJXs
I use to play with corn starch and water in the kitchen too when I was a kid...totally cool. Tapioca starch also works the same way.
Ahahaha!! Cooooooool
This would be a great thing to show the kids! Nicole would have a lot of fun with this