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?”

One liner

Old age comes at a bad time. You finally know everything just in time to forget it.