World Clicking Championship TheElevatorGame.com (and experiment)
theelevatorgame.com
theelevatorgame.com
-edit - but I like the submission by the OP too, I can see it becoming a meme XD
Also, it must be a slow news day for this to get to front page.
So, the lesson is: give your users a perceived reward for taking action on your site, to get them engaged long enough to get the reward.
Or maybe the lesson is: as soon as users perceive there are no rewards left they'll leave.
Also, your app is vulnerable to replay. I can keep POSTing the same request over and over and my score increases.