Dean and Castiel in “Unfinished Business”

Dean

What is this?

Castiel

What does it look like?

Dean

Is it real?

Castiel

Very.

Dean

Okay, so, what? Angels got their hands on some DeLoreans? How did I get here?

Castiel

Time is fluid, Dean, it's not easy, but we can bend it on occasion.

Dean

Well, bend it back, or tell me what the hell I'm doing here!

Castiel

I told you. You have to stop it.

Dean

Stop what? Huh? What, is there something nasty after my dad? [Dean turns as a car horn sounds. When he turns back Castiel is gone.] Oh, come on! What, are you allergic to straight answers, you son of a bitch?!