Updated my upside down ternet scripts for my wireless guest network. Now it includes upside down text :> The new script works by redirecting all requests to phproxy (poxy) which then turns images upside down and runs a javascript to upside down the text.
Link to download is here.
Please note that this is heavily based off phproxy and a javascript text flipper. Credits are in files included.

A mirror (or flip) example site powered by http://s0rs.net/
http://upside.michael-wheeler.org/
Testing firestats.
I like this set up however, the Creator of XKCD.com had the idea quite a while ago, and he’s hits the nail on the head.