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?"