Two guys were taking chemistry at the University of Alabama. They were so confident going into the final that two days before, they decided to go up to the University of Tennessee and party with some friends. They had a great time. However, they overslept and didn't make it back to Alabama until the morning of the exam.
Rather than take the final, they found their professor afterward to explain why they missed the final. They told him that they went up to the University of Tennessee for the weekend, and had planned to come back in time to study, but that they had a flat tire on the way back, and didn't have a spare, and couldn't get help for a long time, so they were late in getting back to campus. The professor thought this over and told them they could make up the final on the following day. The two guys were relieved. They studied that night and went in the next day for the final. The professor placed them in separate rooms, and handed each of them a test booklet and told them to begin.
They looked at the first problem, which was worth 5 points. It was something simple. "Cool," they thought. "This is going to be easy." They did that problem and then turned the page. Question #2 said: "Which tire?" (95 Points).