An eccentric philosophy professor gave a one question final exam. He 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.”
Pencils flew, erasers erased, notebooks were filled; some students wrote over 30 pages.
One student finished in less than a minute. He earned an A for his two-word answer: “What chair?”
