Polaris has a fantastic video clip on her blog. It's what happens when you hit a button you shouldn't have hit, and your webcam and screen go into an infintely-recursive loop. It's the way the sound develops that I like.
I couldn't work out a way to link to the clip directly, so the link goes to her blog instead. It's worth a read while you are there. When she learns how to spell 'continuum' she will be a decent blogger.