Supernatural, Season 3

Sam:
It's not so simple. We're not- we're not just hunting anymore. We're at war.

Dean:
Are you feeling okay?

Sam:
Why are you always asking me that?

Dean:
'Cos you're taking advice from a demon for starters. And by the way, you seem less and less worried about offing people, you know, it used to eat you up inside.

Sam:
Yeah, and what has that gotten me?

Dean:
Nothing, but it's just what you're supposed to do, we're supposed to drive in the friggin car, and friggin argue about this stuff. You know, you go on about the sanctity of life and all that crap.

Sam:
Wait, so you're mad because I'm starting to agree with you?

Dean:
No, not mad, I'm-I'm...I'm worried, Sam. Because you're not acting yourself.