A Joke

There was a cave full of lots of vampire bats. Once, a bat called Andy came home late and there was of blood all over his body. All of his friends and family asked him where the blood came from, and asked him to take place. He didn't want to tell them at first, but after a while, he said "Follow me, folks". Then they flew over a valley, crossed a river, and stopped in front of a stone. Andy asked "Do you guys see that tree?" And his friends all answered "Yes" And then Andy said "I didn't".