Was I dreaming?

'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.'

-Lewis Carrol
'Alice's Adventures In Wonderland'