It is from an orthopedic surgeon............
How smart is Your Right Foot?
It will boggle your mind, and you will keep trying at least 5 more times to see if you can outsmart your foot, but you can't. It is 'preprogrammed' in your brain.
1. WITHOUT anyone watching you (they will think you are STUPID...

2. 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!