Don't Know Why

A friend of mine sent me an e-mail with one of those trivial games you can try out on others that is sure to be amusing to watch. While they are sitting down ask them to raise their right leg straight out and rotate their ankle clockwise. Once they have this down tell them to simultaneously draw a six in the air with their right hand and see if they don't start circling their ankle in the opposite direction. I've tried this on a few people and it seems impossible not to do this, which makes you wonder what's going on in the brain to cause this and would it be different on someone who's been drinking? I should bring this idea up at the substance abuse lab, I'm certain that would be worthy of scientific approval.