t's exam time at the university. the professor tells the class that any exam paper that is not on his desk in exactly two hours will not be accepted, and the student will fail. after two hours, all the students turn in their exam papers, except for one, who continues to write. finally, he attempts to put his paper on top of those already on the professor's desk. "i'm not going to accept that," says the professor. "it's too late." the student looks astonished. "don't you know who i am?" he asks. "no, as a matter of fact i don’t," says the professor. "good," says the student, and quickly shoves his exam paper into the middle of the pile.