If you're bored and up for a challenge...

While sitting at your desk, lift your right foot off the floor and make clockwise circles. Now, while doing this, draw the number "6" in the air with your right hand. Your foot will change direction.

I am very amused at the moment. :)

Note: be sure to check that no one is within viewing distance before attempting the above. Their odd/inquisitive/frightened staring may throw off your concentration.

I found this here, and I believe they found it here.