" Oh, you ca'n't help that," said the Cat: "we're all mad here. I'm mad. You're mad." "How do you know I'm mad?" said Alice. "You must be," said the Cat, "or you wouldn't have come here. "

― Lewis Carroll , Alice in Wonderland: The Complete Collection (Illustrated Alice's Adventures in Wonderland, Illustrated Through the Looking Glass, plus Alice's Adventures Under Ground and The Hunting of the Snark)