Cognitive re-calibration, Natasha Romanoff from Avengers (2012)

Natasha Romanoff: [Clint is waking up from Loki's mind control] Clint, you're gonna be alright.
Clint Barton: You know that? Is that what you know? I got... I gotta go in though. I gotta flush him out.
Natasha Romanoff: You gotta level out, that's gonna take time.
Clint Barton: You don't understand. Have you ever had someone take your brain and play? Take you out and stuff something else in? You know what it's like to be unmade?
Natasha Romanoff: You know that I do.
Clint Barton: Why am I back? How'd you get him out?
Natasha Romanoff: Cognitive re-calibration. I hit you really hard in the head.
Clint Barton: Thanks.

- Scarlett Johansson as Natasha Romanoff from Avengers (2012)

Hero, Loki & Natasha Romanoff from Avengers (2012)

Loki: Your world in the balance and you bargain for one man?
Natasha Romanoff: Regimes fall every day. I tend not to weep over that, I'm Russian... or was.
Loki: What is it you want?
Natasha Romanoff: It's really not that complicated. I've got red in my ledger, I'd like to wipe it out.
Loki: Can you? Can you wipe out that much red? Drakov's daughter, Tugenov, the hospital fire? Yes, Barton told me everything. Your ledger is dripping, it's gushing red, and you think saving a man no more virtuous than yourself will change anything? This is the basest sentimentality. This is a child at prayer... PATHETIC! You lie and kill in the service of liars and killers. You pretend to be separate, to have your own code, something that makes up for the horrors. But they are a part of you, and they will never go away!... No, I won't touch Barton. Not until I make him kill you! Slowly, intimately, in every way he knows you fear! And when he wakes, he'll have just enough time to see the work he's done, and when he screams, I'll break his skull! This is my bargain, you mewling quim!
Natasha Romanoff: [fearfully] You're a monster!
Loki: No, you brought the monster.
Natasha Romanoff: [back in normal state] So, Banner... that's your play.
Loki: What?
Natasha Romanoff: [on intercom] Loki means to unleash the Hulk. Keep Banner in the lab, I'm on my way. Send Thor as well.
[walks out]
Natasha Romanoff: [to Loki] Thank you for your cooperation.

- Avengers (2012)

Persuasion, Natasha Romanoff from Avengers (2012)

Bruce Banner: Should have got paid up front, Banner.
Natasha Romanoff: [comes up behind him] You know, for a man who's supposed to be avoiding stress, you picked a hell of a place to settle.
Bruce Banner: Avoiding stress isn't the secret.
Natasha Romanoff: Then, what is it? Yoga?
Bruce Banner: You brought me to the edge of the city, smart. I uh... assume the whole place is surrounded?
Natasha Romanoff: Just you and me.
Bruce Banner: And your actress buddy, is she a spy too? Do they start that young?
Natasha Romanoff: I did.
Bruce Banner: Who are you?
Natasha Romanoff: Natasha Romanoff.
Bruce Banner: Are you here to kill me, Miss Romanoff? Because that's not gonna work out for everyone.
Natasha Romanoff: No. No. Of course not. I'm here on behalf of SHIELD.
Bruce Banner: SHIELD. How did they find me?
Natasha Romanoff: We never lost you, doctor. We've kept our distance, even helped keep some other interested parties off your scent.
Bruce Banner: Why?
Natasha Romanoff: Nick Fury seems to trust you. But now I need you to come in.
Bruce Banner: What if I said no?

Natasha Romanoff: I'll persuade you.
Bruce Banner: And what if the... other guy says no?
Natasha Romanoff: You've been more than a year without an incident. I don't think you wanna break that streak.

Bruce Banner: I don't get always what I want.

- Natasha Romanoff & Bruce Banner, Avengers (2012)

Bruce Banner & Natasha Romanoff from Avengers (2012)

Natasha: You didn't come here because I bat my eyelashes at you.

Bruce: Yes, and I'm not leaving because suddenly you get a little twitchy.

- Mark Ruffalo as Bruce Banner, Avengers (2012)