I have a fun thing you can try. take your right foot and move it in circle clockwise and with your right hand write the number 6 over and over and see what your foot does
I can pat my head and rub my tummy at the same time (that's how I always heard it), but the hand/foot thing is freaky!! I'm sure there's some fancy neuromuscular reason for it, but it's still freaky!
Though I think trying to do it might awaken some dormant brain cells!