“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn’t. And contrary wise, what is, it wouldn’t be. And what it wouldn’t be, it would. You see?”

—

“But I don’t want to go among mad people,” Alice remarked. “

Oh, you can’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.”

(Alice’s adventures in Wonderland – Lewis Carroll)