Once upon a time there was a female brain cell which, by mistake, happened to end up in 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?"
Then she heard a voice from far away: "Hello, we're down here...."