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... There were no other brain cells.
"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, HEY, IS THERE ANYONE HERE?"
Then she heard a faint voice from far, far away say : " we're all down here...."