Sam and Dean in “Unfinished Business”

Sam

Hey, we good?

Dean

Aces. Yeah, I love the smell of parchment in the morning.

Sam

I mean how much lore is even left? We got nothing on the Mark?

Dean

Right, you think these eggheads with all the crap they amassed over the years would have actually collected something important. Ah, here -- 'He-wolf, She-wolf: A Study in Werewolf Transgenderism,' six hundred pages, volume one. But, uh, something important, like I don't know maybe the oldest symbol known to man -- 'that's not worth our time, it's not weird enough.'