Here's something you can do on your desk if you're feeling bored staring at the screen this very moment. Yes. I know the blog is getting boring.
Bumped into this when surfing Digg, find it interesting so decided to share. I believe some of you might have heard this before. The human brain is just so stubborn. Try drawing a square with one hand and a circle with the other.
In case you can't read it.
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 and there's nothing you can do about it.