Apple currently have an Advert running on Pitchfork that is quite ingenious in how it works.

It can still be viewed on http://pitchforkmedia.com but for future reference, here is a YouTube video of the same I recorded.

http://www.youtube.com/watch?v=vptZKEsY00U

it is similar to the previous advertisement on Yahoo! Games

http://www.youtube.com/watch?v=sSZ_IAXuSSk

Also remids me of the WarioWare YouTube video from a while back...

I must admit, thats a very cool effect!