Alice in Wonderland

March Hare: Have some more tea?

Alice: I haven't had any yet, so I can't take more.

March Hare: You mean you can't take less. It is very easy to take more than nothing.

I've often seen a cat without a grin - but a grin without a cat!

The Mad Hatter: Have I gone mad?
Alice Kingsley: I'm afraid so. You're entirely bonkers. But I'll tell you a secret. All the best people are.

Alice's adventures in wonderland

"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."