Try this!

Left Brain, Right Brain

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.

Dollar Bill Pickup

Stand with your back to a wall.

Lay a dollar bill, or paper of the same size, on the floor about 1 foot in front of your feet.

Without bending your knees or twisting sideways 

and with your heels touching the wall 

try to pick up the dollar.