5x18: SAM: I saw your eyes. You were totally rockin' the "yes" back there. So, what changed your mind?
DEAN: Honestly? The damnedest thing. I mean, the world's ending. The walls are coming down on us, and I look over to you and all I can think about is, "this stupid son of a bitch brought me here." I just didn't want to let you down.
5x18: DEAN: Word to the wise--don’t piss off the nerd angels.
5x18: ZACHARIAH: You know Sam and Dean Winchester are psychotically, irrationally, erotically codependent on each other, right?