Good joke

For a philosophy final exam at a nearby college, the professor put a chair on the desk at the front of the room and announced: "For this exam, using all you've learned this term, prove that this chair does not exist." The students began writing furiously. Except for one who wrote for just a few moments and then turned in his paper to the surprise of the other students. A week later grades came out, and this student received the only "A". On his paper he had written: "What chair?"

Joke credits go to Susan who is here for the day visiting her grandchildren. Love it! Had to share.