OK, this is for YOU, lj - here's an explanation of what's on that audio post.
When I was at university, I was forced to take a computer class as part of my degree plan. This was a very basic "what's a CPU?" kind of course, which I had been way beyond for years.
The teacher was a middleaged cornball who was kind of adorable. In his northeastern accent he said things like "you'll want to bring your swimsuit to class because you will be surfing the information superhighway," and "by the end of the semester, you will be able to send and receive email."
I was bored and skipped a lot of classes and missed most of the pop quizzes which were a third of the grade. At semester's end, I calculated that in order to scrape by passing the class with a D, I needed to make a 100 on the final exam. Not 99 - 100. Eek.
So, day of the final exam, I whiz through the first 2 pages, relieved I know everything so far, when there's a rumble in the middle of the class (about 300-350 students.) I go on with my work, by the professor goes up to the middle area to talk with one of his teaching assistants and a student.
Suddenly he says to the group "who in here doesn't have pages 3 & 4 in their exam?). I had them, but about a third of the class raised their hands, indicating they didn't have the middle bit of the test.
He told us to turn in our tests, that everybody was getting a 100.
Whew. Off the hook!