Two guys were taking a chemistry class at the University of Alabama. They were doing well in the class and thought that going into the final with a solid "A." They were so confident that the weekend before finals week, they went to the University of Tennessee to party with some friends. They had a great time. However, because they had hangovers, they slept all day Sunday and didn't make it back to Alabama until early Monday morning, the day of the exam.

Rather than taking the final, they found their professor after it was over and explained why they missed the final. They told him that they went to the University of Tennessee for the weekend and had planned to come back in time to study, but had a flat tire on the way back. Since they didn't have a spare and couldn't get help for a long time, they were late in getting back to campus. The professor told them they could make up the final on the following day. They were elated and relieved.

The next day, the professor placed them in separate rooms, handed each of them a test booklet, and told them to begin.

The first problem, worth five points, was something simple about Molarity & Solutions.

"Cool," they both thought. "This is going to be easy."

The next problem was worth 95 points. It said, "Which tire?"