Magic Tricks

I was disappointed within two minutes of watching the instructions because they show the trailer performance again, where the boy cleans out the cup, but this time they actually show it for a few more seconds and the move was obvious to me - a move that was edited out of the trailer (when the scene cuts at 21 seconds). The magician actually does go near the cup again after it's cleaned out. I was hoping for something more mechanical, like a shake-release, or a tilt-release, built into the cup.