An eccentric philosophy professor gave a one question final exam after a semester dealing with a broad array of topics. The class was already seated and ready to go when the professor picked up his chair, plopped it on his desk and wrote on the board: "Using everything we have learned this semester, prove that this chair does not exist."
Fingers flew, erasers erased, notebooks were filled in furious fashion. Some students wrote over 30 pages in one hour attempting to refute the existence of the chair. One member of the class however, was up and finished in less than a minute.
Weeks later when the grades were posted, the rest of the group wondered how he could have gotten an A when he had barely written anything at all. His answer consisted of two words: "What chair?"
Great news, Mr. Bradley," the psychiatrist reported. "After eighteen months of therapy, I can pronounce you finally and completely cured of your kleptomania. You'll never be trapped by the desire to steal again."
"Gee, that's great, Doc," the patient replied.
"And just to prove it, I want you to stop by the mall on the way home and walk the length of the stores. You'll see that you'll feel no temptation to shoplift whatsoever."
"Oh, Doctor, what can I do to thank you?"
"Well," suggested the psychiatrist, "if you DO have a relapse, I could use a new TV."