Real life Mario Kart from Waterloo Labs, via MAKE:

The goal of this project is to recreate Nintendo’s Mario Kart game in real life. This involves building a system to control the movements of a full sized go-kart as well as a wireless communication system. The end result is a go-kart system where each player can race around a track and pick up items that can alter the behaviors of the go karts. Special Thanks to Austin’s Park  for letting us modify their karts and track.

Read more.