The chap invigilating with me was from the Theology department. He runs a neat web site about his courses. I said something along the lines that I would love to come back to university and do a subject like Theology where you can "never be wrong".
"Sure" he replied, "You can never be wrong. But you can be stupid". That is such a superb observation. I spent a big chunk of the invigilation wondering whether I'd rather be wrong or stupid.
Still not sure.