This is cool.. Give it a try!
Step 1:
You are already sitting at your desk, in front of your computer. That’s fine, stay there. Lift your right foot off the floor and make clockwise circles.
Step 2:
Now, while doing this, draw the number 6 in the air with your right hand.
Step 3:
Your foot with automatically change direction.
You can try to outsmart your foot, and attempt it again and again, with the same result.