Which Tire?

[Jack Ryan]

It was finals week and four college seniors decided they had worked hard enough.
Instead of studying for their last final, they went to a party.  They were having so much fun, they lost track of time and missed the final.
The next day, they went to the professor and begged for a makeup final.  To explain their absence they said their car had blown a tire on the way to the exam and there was no spare in the trunk.  The professor agreed to let them take the test later that day.
The test time came and the professor put each young man in a separate room and handed out the test. It was a single sheet of paper with one question… 

“Which Tire?”

via Humor