Sam and Dean in “Unfinished Business”

Sam

Dean, uh, I want to thank ya.

Dean

For what?

Sam

For everything. You've always had my back, you know. Even when I couldn't count on anyone, I could always count on you. And, uh, I don't know, I just wanted to let you know, just in case.

Dean

Whoa, whoa, whoa, you kidding me?

Sam

What?

Dean

Don't say "just in case something happens to you"; I don't want to hear that freaking speech, man. Nobody's dying tonight, not us, not that family, nobody. Except that demon. That evil son of a bitch ain't getting any older than tonight, you understand me?