Remember college exams? In addition to being the main stressor of your early twenties existence, there was always a little bit of hope for redemption: The extra credit questions. Usually, extra credit meant some kind of obscure question or problem that was covered in class (but just barely), a special bonus the professor gave to those students who were listening really, really well. But this professor decided to go a different route with his extra credit questions: Instead of grilling students on the subject at hand, he decided to have a bit of fun and ask far more important questions.
