Some people chose the pong life. They want to move their heads and bodies to block incoming fireballs. It is their passion. Me... I was thrust into it. But I'm still the best.
Requires modern browser, webcam, human head.
Move your head back and forth.
Works on chrome, opera, firefox nightly (http://caniuse.com/#feat=stream)
nodejs, express, zepto, coffeescript, jade, browserify, node-dev, socket.io