Another one to try... (and a slightly different angle on the display of t*ts...)
As your sitting in your chair... lift your right foot and swing it in a clockwise circle... then, keeping your foot moving, stick out your pinky (that's your finger...!) and slowly draw a '6' in the air....
Now see if your foot is still going clockwise...
Any helicopter pilots out there who get this wrong should seriously consider a change of career!!