It was the end of the school year, and a kindergarten teacher was receiving gifts from her pupils. The florist's son handed her a gift. She shook it, held it overhead, and said, “I bet I know what it is. Some flowers.” “That's right.” the boy said. “But how did you know?” “Oh, just a wild guess,” she said. The next pupil was the sweet shop owner's daughter. The teacher held her gift overhead, shook it, and said, “I bet I can guess what it is. A box of sweets.” “That's right. But how did you...