It's a rare beast, but I tracked it down...
This is what happens when it snows so you can't go to work and you have a Mac with the new version of iMovie
Note - on 'normal' this vid looks really blocky, but there is a high quality version available that has audio too. It's a bit annoying it plays the crappy version by default...
Info on choosing which version here:
http://www.google.com/support/youtube/b ... swer=91449