This is a true story about Professor Bonk who taught chemistry at Duke University. One year, three students were taking chemistry and all earning a solid "A" going into the final exam. The weekend before finals they decided to go to another school to party with some friends. They didn't make it back to Duke until early Monday morning, in no shape to take the final.

They explained to Professor Bonk that they had been away for the weekend and had planned to come back in time to study, but they had a flat tire on the way back and didn't have a spare, so they didn't get back to campus in time.

Professor Bonk agreed to let them make up the final on the following day. What a relief! They studied all night. When they arrived for the exam, Professor Bonk placed them in separate rooms, handed each of them a test booklet, and told them to begin.

They saw the first question was simple, worth 5 points. Piece of cake! Then they turned to question 2, worth 95 points: "Which tire?"