Technology will never cease to amaze us. Microsoft's Kinect motion sensor is now being trained in Japan to follow human tongue movement. Aside from the goofy nature of the concept, the idea behind this is to train the tongue for those with speech and swallowing disorders.
http://www.youtube.com/watch?feature=player_embedded&v=jWIl3CtH6SE#ws (http://www.youtube.com/watch?feature=player_embedded&v=jWIl3CtH6SE#ws)
Source: Engadget