| The Riddler: | What is it that walks on four legs, then two legs, and finally three legs?
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| Dr. Young: | A human being. As a baby it crawls on four legs, as an adult it walks on two, and in later years it uses a cane.
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| The Riddler: | Good try, but the answer to all three is a baby. True, it crawls on all fours, but cut off its legs and it can only wiggle on two limbs. Give it a crutch and it can hobble around on three. You see?
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| Dr. Young: | That's horrible. How can you even joke about that?
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| The Riddler: | Easily, Doctor. It's not my baby. |