If you are running Tiger, happen to have an iSight plugged in and it hasn't been commandeered by some other application, the QuickTime movie to the left is actually a Quartz Composer patch that stylizes video in an A-Ha! sort of way.
The QC patch can be downloaded.
It is a copy of one of Sam Kass's amazing collection of patches. I modified it such that it should display a "need video" kind of message if you are lacking an iSight or it is in use by another application.