Once upon a time three men put a bet with a man they thought was a fool. They said, that if he went to a graveyard and brought home a skull, that he would get a hundred pounds.
So he went away but the three boys were behind the coffins. When the man was about to take the first skull, he head a voice say "Leave that there, that is mine".
He went to the next coffin and he heard a voice say "Leave that there, that is mine". He got frightened then.
When he went to the third coffin, he heard a voice saying "Leave that there, that is mine". He picked up the third skull and said, "They all can't be yours", and then ran away.