Supernatural, Season 6

Bobby:
You want to explain what this is about?

Sam:
I just, uh, I have to do this, Bobby.

Bobby:
Says who?

Sam:
When Dean shoves that soul back in me, think how bad that could really be. I can't let it happen, Bobby. I mean it's not like I want to kill you, you've been nothing but good to me.

Bobby:
So what, demon deal or somethin'?

Sam:
Spell.

Bobby:
You're makin' a mistake, Sam.

Sam:
I'm trying to survive.

Bobby:
Dean's got a way to make it safe.

Sam:
Oh, yeah, what some wall inside my head that maybe stays up? Come on.

Bobby:
If it works...

Sam:
Well, what if it doesn't? Dean doesn't care about me. He - he just cares about his little brother, Sammy, burning in Hell. He'll kill me to get that other guy back.

Bobby:
Look, I... I know how scary it is. You know what's scarier? You right now. You're not in your right head Sam. You're not giving us much choice here.