Check out Pong Prom from Ed Keeble

http://dvice.com/archives/2009/12/pong-prom-turns.php

You're already familiar with the classic game, Pong: there are two paddles, one on each side of the screen, and you try to keep the ball that bounces between them from flying off your side. Well, a chap by the name of Ed Keeble has decide to update the revered title, but with a sexy twist. Instead of using a joystick, two players control their paddles by slow dancing with one another.

An accelerometer built into each suit keeps track of each player's swaying and guides each paddle back and forth accordingly, as Keeble describes it: "The project uses the Lilypad Arduino platform to control game play, run the display, and communicate between devices. Patches of conductive fabric on the shoulders, hips, and cuffs of the shirts are used to create a serial connection between the Arduinos. An accelerometer attached at the back of the neck allows each player to control their game paddle by rocking their partner back and forth."