http://www.ex-parrot.com/~pete/upside-down-ternet.html
Hahahahaha!
And I found the link via Zentastic.com, a sometimes crazy and off-the-wall blog that sometimes posts NSFW content, be fairly warned. Is Pete planning a post for a story here? It'd make a good story about the internals of it all... 
That's too sweet!
Yeah, we run Squid at work, and I showed our network admin that "feature" a couple months ago...he and I agreed that it would work great as an April Fools Day prank.