Sony's got balls...
Check out this Sony commercial where they unleashed a ton o' balls on an SF hill. Or as Sean put it:
Follow up:
You think the last thing I'd ever do is point you to a megacorporation's TV commercial. At least without being paid. Yet here I am doing it. Because you've gotta see it.
A couple of months ago they dumped more than 250,000 colored rubber bouncy-balls on a typical hill in San Francisco and just filmed the balls bouncing down the steep streets, and set it to music. It's a beautiful thing and it's so San Francisco. So when you can spare 5 minutes:
(That link doesn't work for me. But, from the command-line using wget (or by hitting Opt-click in FireFox) you can download the file which is here: http://www.bravia-advert.com/includes/vid/bravia_60_sec_high.mov Although you've got to have QuickTime 7 to view this movie (as it use's H.264))