Once a rakshasa (demon) came to a king’s court with three skulls and threatened to eat the king unless he could correctly point out which was the best skull out of the three. The king asked three days’ time, and the demon agreed. Then the king asked his court pundits as to which of them was the best. None could say anything since all the three resembled outwardly all alike.
One intelligent pundit came and passed a rod through one ear of the first skull, and the rod went straight through the other ear.
Then he made the rod pass through the second skull. In this case, the rod, inserted through one ear, came out of the mouth.
Then the rod was made to pass through the third skull. When inserted through one ear, the rod went right into the chest.
The court-pundit remarked that the third skull was the best.
-- Sri Swami Chidananda