Two Travelers disputed who owned the Oyster they found. A third Traveler judged the dispute, handed each a shell, and ate the Oyster as payment. Ooops! Justice is in the eye of the beholder.
The Dog ate an Oyster thinking it was an egg. He suffered greatly in his stomach due to this rash action. Dog should have thought before acting. They who act without sufficient thought, will often fall into unsuspected danger.