Check out this awesome video of a real-life Mario Kart race. The race is so realistic that players who run over RFID power up bananas get more power transmitted to their go karts.
Here is the description:
In this episode we rig up four go Karts so we can manipulate the throttle, gas and brakes along with an RFID Item system so we could make a REAL playable version of Mario Kart
Watch the video from Waterloo Labs: