Sam: What about Crowley? You, uh… [mimes slicing throat]
Dean: I would’ve loved nothing better than to ice that limey bitch. But then I thought to myself, what would Sam Winchester do?
Sam: I’d’ve stabbed him in the brain.
Dean: Oh. (beat) Well, I figured the King of Hell might know a few things, so why not Zero Dark Thirty his ass?
Sam: Wait, so Crowley is… alive?
Dean opens the Impala’s trunk to reveal Crowley.
Dean: Oh yeah. He’s the junk in my trunk.

Sooooo, Crowley would be dead right now if Dean hadn’t done a WWSWD.