'"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 didn't think that proved it at all; however, she went on 'And how do you know that you're mad?"
Alice from Wonderland
From the great Mark Ryden!