Four high school kids who carpooled together decided to skip school and spend the day fishing.
The next day they told the teacher that they had had a flat tire, and couldn't make it to class.
Much to their relief, she smiled and said, "Well, you missed a pop quiz yesterday, so take seats apart from one another and take out a piece of paper." Still smiling, she waited for them to sit down.
Once they were seated and ready, she said: "First Question: Which tire was flat?"