Know your story

At the University of North Carolina, there were four sophomores taking
Chemistry and all of them had an "A" so far. These four friends were so
confident that the weekend before finals, they decided to visit some friends
and have a big party. They had a great time, but after all the hearty
partying, they slept all day Sunday and didn't make it back to Duke until
early Monday morning.

Rather than taking the final then, they decided that after the final they
would explain to their professor why they missed it.

They would say that they visited friends but on the way back they had a flat tire.

As a result, they missed the final.
The Professor agreed they could make up the final the next day.

The guys were excited and relieved.

They studied that night for the exam.
The day of the exam the Professor placed them in separate rooms and gave them each a test
booklet.

They quickly answered the first problem worth 5 points.

Cool, they thought!

Each one in a separate room, thinking this was going to be easy.
Then they turned the page...



On the second page was written:



"For 95 points: Which tire?" ? ? ?



(I didn't make this up - a friend sent it to me and I have no idea who wrote it.
If I did know the author's name, you would find it here.)