Total madness!! I already saw mods of the most varied, but this totally new for me: Eddie Zarick put an LCD screen on the back of a black MacBook! And you know what better? Mac OS X recognizes it as a secondary monitor !! Simply fantastic.
(youtube) http://www.youtube.com/watch?v=is5GZNHPfo0 (/ youtube)
Yes, that's right: if he wants, he can just set a white background to use it like any backlit gadget, but if he prefers, he can send the image he wants backwards, including videos, his iSight camera and even iTunes viewers, which is really cool.
He just didn't say how much the joke cost him.