That scene in which the Impala is driving along with one broken headlight to loud driving music made my mind immediately leap to Withnail and I. Dean would, I suspect, be Withnail. Although I don't imagine that particular duo would be quite as good at hunting demons as the Winchester boys are.

Damn, now I'm imagining Dean in Withnail's clothes, looking for the world like an 18th Century rent-boy. But I was thinking of that before so I shouldn't even blame you. ;)