While sitting at your computer, raise your right foot off the floor and begin to rotate it in a clockwise direction. At the same time use your right hand to draw an invisible number six in the air and see what happens to your rotating right foot.
I can do the tummy and head thing(I had to prove my big brother wrong when I was littler)but the foot thing freaky.When I was in hospital I had my reflexes tested as I was having nerve problems,and when the Dr hit my right knee,the left leg sprang up!That freaked me a bit!
Yes, as soon as you start to draw a six in the air (ie your index finger stars going anticlockwise, your foot cannot continue in a clockwise direction.
wow... well I've managed to give my right ankle a good work-out.... I swear it just insists on carries on clockwise. I've just tried it with my left ankle/hand, and my foot goes all squee-wif when I do 6.... guess that only makes me semi-abnormal now :-)