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    One Sunday morning, Ben went to a barber's(理发师)shop and had his hair cut. When he came out, he was not happy with the result. In the evening, he met his friend Bob. He laughed and asked. "What happened to your hair, Ben?"

    Ben agreed, "Yes, I think you're right, Ben.Mind you!Now I'll tell you what to do when you go into a barber's shop next time. What you need to do first is to look at all the barbers' hair, find out whose hair looks the worst, and then go straight to him."

    "Why shall I go to him?" Ben asked in amazement, "But that would be foolish(愚蠢的)!"

    "Oh, no, it wouldn't," answered Bob. "Who cut that man's hair? Just think about it. He couldn't cut himself, could he? Another of the barbers cut it.      "