Sam and Dean in “Unfinished Business”

Sam

Something is wrong with you, Dean. And until we figure out what, this is where you have to stay.

Dean

And you two are gonna do what? Take on Metatron yourselves? That's smart. Oh, no, wait. No, you... [motions to Castiel] you lost your Angel army. And you... [motions to Sam] now you're trying to lock up the one guy who has a shot at killing the son of a bitch?! Hell of a plan, fellas!