dark arts

I used to like doing those reader's digest quizzes where you would answer some questions and then, based on your score, it would tell you something about yourself - like, you're an extrovert or you're a naturally happy person or....actually, I can't remember a single one of those quizzes, but it was always interesting the way that a kind of magic was involved. You would answer seemingly random questions, and then would find out some incredible insight about yourself.