Two bats were sitting in a cave. Suddenly one flew out into the night and yelled: "Man, I’m starving! I need to get some blood!" He returned about three hours later, with blood dripping from his fangs and mouth. "Where’d you get the blood from?" asked the other bat. "Well, you go out the cave... And you see the first tree on the left?" "Yes," the other bat replied. "Well, I didn't."