A small Swedish development company Moment 77 has come up with a use for Augmented Reality (AR) that you are going to want to know about.

Wear the right t-shirt in front of a machine with a web-cam and its Flash application will allow you to play the thrilling game of rock-paper-scissors or Roshambo with yourself - or rather with an alien looking arm that sprouts out of the on screen image of the t-shirt. The idea is not only to demo AR but to sell t-shirts. 

You can see a video demo at the company's website or on YouTube