Once upon a time there was a female brain cell which mistakenly wandered into a man's head. She looked around nervously but it was all empty and quiet. "Hello?" she cried, but no answer. "Is there anyone here?" she cried a little louder, but still no answer. Now the female brain cell started to feel alone and scared and yelled: "HELLO, IS THERE ANYONE HERE?" Finally she heard a voice from far, far away:"Hello......... we're down here.........."