The Anatomy of a Trivial Question

At the moment i have approximately 160,000 flash cards in my inventory. I am very vigilant about not adding information that i already know. So if i add something, it's something that i've deemed worth learning and something that i hope i don't already have. The anatomy of a trivial question is that you have a hook andyou have a pin - why would anybody care about this? Why would anybody want to answer it? And the pen is, what is the thing that makes this question have uniquely one, and only one correct answer?