Saw that before. I got suspicious when I saw what looks like a static image in an .swf... Even then I wasn't ready for it.
Got the kids with it real good.
I believe jaybill.com had it originally. People without sound were missing the punch and writing him asking "What IS wrong?".
He wrote a version for the "observationally impaired" that I can't find anywhere. Jaybill's not hosting it anymore. He says "stick a fork in it, it'd done."
It was good. Same as the other one, but spoiler hints everywhere.