The QOTD isnt there for us to score points... its there to teach/spread knowledge.
Exactly. I knew I was answering the question incorrectly -- it was the result I would have expected, which is never the right answer in QotDs -- but I went with that answer anyway because I wanted to learn something. I have no idea how many "points" I have, nor do I care, nor do I know what I would do with that information if I had it.
[edit: Okay, now I see how many points I have. And then what, can I trade them in for prizes like skee-ball tickets or something?]
NULL is not zero
NULL is not an empty string
NULL is the unknown