Nightmare Dean and Dean in “Unfinished Business”

What are the things that you want? What are the things that you dream? I mean, your car — that's Dad's. Your favorite leather jacket — Dad's. Your music — Dad's. Do you even have an original thought? No. No, all there is is, "Watch out for Sammy. Look after your little brother, boy!" You can still hear your dad's voice in your head, can't you? Clear as a bell.

Dean

Just shut up.

I mean, think about it. All he ever did was train you, boss you around. But Sam, Sam he doted on. Sam, he loved.

Dean

I mean it. I'm getting angry.

Dad knew who you really were. A good soldier and nothing else. Daddy's blunt little instrument. Your own father didn't care whether you lived or died! Why should you?

Dean

Son of a bitch! My father was an obsessed bastard! All that crap he dumped on me about protecting Sam, that was his crap! He's the one who couldn't protect his family! He... He's the one who let Mom die, who wasn't there for Sam! I always was! He wasn't fair! I didn't deserve what he put on me, and I don't deserve to go to Hell! [shoots the Nightmare version]

[with black, demon eyes] You can't escape me, Dean! You're gonna die, and this... this is what you're gonna become!