Supernatural, Season 4

Castiel:
Your friend's alive.

Dean:
Who are you?

Castiel:
Castiel.

Dean:
Yeah, I figured that much, I mean what are you?

Castiel:
I'm an Angel of the Lord.

Dean:
Get the hell out of here. There's no such thing.

Castiel:
This is your problem, Dean. You have no faith. (wings appear)

Dean:
Some angel you are. You burned out that poor woman's eyes.

Castiel:
I warned her not to spy on my true form. It can be... overwhelming to humans, and so can my real voice. But you already knew that.

Dean:
You mean the gas station and the motel. That was you talking? (Castiel nods.) Buddy, next time, lower the volume.

Castiel:
That was my mistake. Certain people, special people, can perceive my true visage. I thought you would be one of them. I was wrong.

Dean:
And what visage are you in now, huh? What, holy tax accountant?

Castiel:
This? This is... a vessel.

Dean:
You're possessing some poor bastard?

Castiel:
He's a devout man, he actually prayed for this.

Dean:
Look pal, I'm not buying what you're selling, so who are you really?

Castiel:
(frowning) I told you.

Dean:
Right. And why would an angel rescue me from Hell?

Castiel:
Good things do happen, Dean.

Dean:
Not in my experience.

Castiel:
What's the matter? You don't think you deserve to be saved?

Dean:
Why'd you do it?

Castiel:
Because God commanded it. Because we have work for you.