Supernatural, Season 2

Dean:
Before Dad died he… he told me something. Something about you.

Sam:
What? Dean, what did he tell you?

Dean:
He said that he…he wanted me to watch out for you. Take care of you.

Sam:
He told you that a million times.

Dean:
No, this time was different. He said that I had to…save you.

Sam:
Save me from what?

Dean:
He just said that I had to save you. Nothing else mattered. And if I couldn't, I'd…

Sam:
You'd what, Dean?

Dean:
I'd have to kill you. [Sam looks at him, confused.] He said that I might have to kill you, Sammy.

Sam:
Kill me? What the hell is that supposed to mean?

Dean:
I don't know.

Sam:
I mean, he must've had some kind of reason for saying it, right? Did he know the demon's plans for me? Am I supposed to go dark-side or something?! What else did he say, Dean

Dean:
Nothing. That's it, I swear.

Sam:
How could you not have told me this?!

Dean:
Because it was dad and he begged me not to.

Sam:
Who cares? Take some responsibility for yourself, Dean! You had no right to keep this from me!

Dean:
You think I wanted this? Huh? I wish to God he'd never opened his mouth! And I wouldn't have to walk around with this screaming in my head all day!

Sam:
[after a long pause] We've just gotta figure out what's going on then, what the hell all this means.

Dean:
We do? I've been thinking about this, I think we should just lay low, you know? At least for a while. It'd be safer. And that way, I could make sure…

Sam:
What? That I don't turn evil? That I don't turn into some kind of killer?

Dean:
I never said that.

Sam:
Jeez, if you're not careful, you will have to waste me one day, Dean.

Dean:
I never said that! Damn it, Sam, this whole thing is spinning out of control! Alright? You're immune to some weirdo demon virus, and I don't even know what the hell anymore. And you're pissed at me, and I get it. That's fine, I deserve it. But we lay low until we figure out our next move, okay?

Sam:
Forget it.

Dean:
Sam, please, man. [He grabs Sam's shoulder] Hey, please. Just give me some time. Give me some time to think, okay, I'm begging you here. Please…please. [Sam nods]