Is it just me or do I see absolutely no skill needed for dice stacking? Seems just a matter of physics. i.e. move the cup with enough force and get the dice to move around and they will plaster themselves to the side, stacking themselves.
It is just a matter of physics. I couldn't tell how he was doing it, until I heard the sound that the cup was making. He's catching them in the cup and managing to spin them to hold them to the wall. Still I thought it was a very nifty trick. I couldn't spin them that way meself. In fact, I just tried. d6s all over the place. My cats and my daughters enjoyed it though.