Co-ordination and Mind Management game

While sitting down (or standing if you have good balance), lift your right foot off the floor and make clockwise circles with it. At the same time, repeatedly draw the number 6 in the air with your right hand.

Your foot will change direction and without an awful lot of practice, there's nothing you can do to prevent it.

This effect seems to be because drawing the number 6 is effectively a counter-clockwise movement which the brain can't reconcile easily with a clockwise one (a bit like patting your head and rubbing your stomach at the same time). If you draw the six from the middle and end with the up-stroke instead, it doesn't conflict with the clockwise foot motion, because the 6 is now a clockwise motion too. What's strange is how we've evolved to enable same direction movements with different limbs, and to resist opposite ones - There doesn't seem to be a survival benefit from this, unless it's a bi-product of an overall more co-ordinated (and therefore more efficient, quicker, athletic) movement capability, which would of course have been a survival aid.