4 college students had an exam. They decided to go party instead and come up with an excuse the next day. They walk in the next day and tell the professor that they were driving to take the exam and a tire blew out and asked if he could give them a chance to take the test now. He agreed but let them know that the test would be a bit different, it would only have one question, if they answered it correctly they would pass, if not they would fail. They all agreed.
The next day he sat them all down in seperate corners of the room and handed them all a sheet with one question. “Which tire?”