Supernatural, Season 4

Dean:
What are we doing?

Sam:
We're hunting a ghost.

Dean:
A ghost, exactly. Who does that?

Sam:
Us.

Dean:
Us, right. And that Sam that is exactly why our lives suck. I mean, C'mon, we hunt monsters! What the hell? I mean, normal people, they see a monster and they run. But not us, no no no, we...we search out things that want to kill us! Yeah, huh? Or eat us! You know who does that? Crazy people! We ... are insane! You know, then there's the crappy diner food and the-and the skivvy motel rooms and then truck stop waitress with the bizarre rash. I mean, who wants this life, Sam? Huh? Seriously! I mean do you actually like being stuck in a car with me eight hours a day every single day? I don't think so! I mean, I drive too fast and I listen to the same five albums over and over and over again and I- and I-I sing along, I'm annoying, I know that. And you…you're gassy! You eat half a burrito and you get toxic! I mean, You know what, you can forget it.

Sam:
Dean, where're you going?

Dean:
Stay away from me Sam, okay? Because I am done with it. I'm done with the monsters and the-and the-and the hell hounds and the Ghost Sickness and the damn apocalypse. I'm out, I'm done, I quit.