lol @ youtube link. I played one like this not too long ago but she was more discreet. She waits until YOU'RE shooting before bouncing up and down.
micah: don't assume I don't understand something just because I call it crap =) I'm pretty handy with geometry and physics. The point I'm making is it doesn't impress me to see KE = (?)MV? or whatever... and it shouldn't impress anyone else either. If anyone is going to go a pool school based on seeing something like that, they've been duped. It's not that it isn't worth learning, it's just that if you're paying money to learn it you're robbing yourself and could be investing your money better.
Hopefully aoyster is only putting that stuff in the promo to impress newbies, and he switches to simple and more practical stuff like 90 & 30 deg. rules once they're successfully lured into a classroom (though I wonder if he isn't shooting himself in the foot by making pool knowledge look more intimidating and boring than it really is)