I found this in Chad's list-o-links today.
I'd seen something about this on TV (Oddball?), but none of the details. The ball was only going 50 mph? Sheesh.
To make up for that, some real science: Chladni patterns.
If you click to go to YouTube, you will see the Rubens' Tube demo done by the Mythbusters guys listed in the side bar. (Or just wait for it to come up on the "related" links after the video finishes.)