In a truly magical universe everything has its opposite. For example, there's anti-light. That's not the same as darkness, because darkness is merely the absence of light. Anti-light is what you get if you pass through darkness and out the other side. On the same basis, a state of knurdness isn't like sobriety. By comparison, sobriety is like having a bath in cotton wool. Knurdness strips away all illlusion, all the comforting pink fog in which people normally spend their lives, and lets them see and think clearly for the first time ever. Then, after they've screamed a bit, they make sure they never get knurd again.