Alice: But I don't want to go among mad people. The Cat: Oh, you can't help that. We're all mad here. I'm mad. You're mad. Alice: How do you know I'm mad? The Cat: You must be. Or you wouldn't have come here. Alice: And how do you know that you're mad? The Cat: To begin with, a dog's not mad. You grant that? Alice: I suppose so, The Cat: Well, then, you see, a dog growls when it's angry, and
wags its tail when it's pleased. Now I growl when I'm pleased, and wag
my tail when I'm angry. Therefore I'm mad.