'But I do not want to go among mad people,' Alice remarked. 'Oh, you can't help that,' said the Cat: 'we're all mad here, you see. I'm mad. You're mad.' 'How do you know I'm mad?' said Alice. 'You must be,' said the grinning Cat, 'or you would not have come here.'

'a dog's not mad. You grant that?' ' suppose so,' said Alice. 'Well, then,' the Cat went on, '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.'