Three bats lived in a cave surrounded by three castles. One night, the bats bet on who could drink the most blood. The first bat came back with blood on his fangs. He said “See that castle over there? I drank the blood of three people.” The second bat comes back with blood all over his mouth. He said “See that castle over there? I drank the blood of five people.” Then the third bat comes back covered in blood. What does he say?