Supernatural, Season 2

Dean:
No one can control you but you.

Sam:
It sure doesn't seem like that, Dean. It feels like no matter what I do, slowly but surely, I'm-I'm just becoming-

Dean:
What?

Sam:
Who I'm meant to be. I mean, you said it once yourself, Dean. I've gotta face up to who I am.

Dean:
I didn't mean this!

Sam:
But it's still true! You know that! Dad knew that, too! That's why he told you if it ever came to this-

Dean:
Shut up, Sam!

Sam:
Dean, you promised him. You promised me.

Dean:
No. Listen to me. We're gonna figure this out, okay? I mean, there's gotta be a way, right?

Sam:
Yeah, there is. [He takes his gun from his bag and holds it out to Dean.] I don't wanna hurt anyone else. I don't wanna hurt you.

Dean:
You won't. Whatever this is…you can fight it.

Sam:
No. I can't. Not forever. [He begins to tear up.] Here, you've gotta do it. [He puts the gun in Dean's hand]

Dean:
You know, I've tried so hard to keep you safe.

Sam:
I know. [Dean pauses for a long time, looking at the gun.]

Dean:
I can't. [beat] I'd rather die. [He drops the gun on the floor.]

Sam:
No. You'll live. [He picks up a second gun and turns to Dean.] You'll live to regret this. [He knocks Dean out with the gun and leaves the room.]