Captain America: The Winter Soldier.
Steve Rogers (Captain America) & Natasha Romanoff (Black Widow).
Romanogers.

Natasha: Where did Captain America learn how to steal a car?
Steve: Nazi Germany. And we're borrowing. Take your feet off the dash.
Natasha: Alright, I have a question for you, of which you do not have to answer. I feel like if you don't answer it though, you're kind of answering it, you know?
Steve: What?
Natasha: Was that your first kiss since 1945?
Steve: That bad, huh?
Natasha: I didn't say that.
Steve: Well, it kind of sounds like that's what you're saying.
Natasha: No, I didn't. I just wondered how much practice you had.
Steve: I don't need practice.
Natasha: Everybody needs practice.
Steve: It was not my first kiss since 1945. I'm ninety-five, I'm not dead.
Natasha: Nobody special, though?
Steve: Believe it or not, it's kind of hard to find someone with shared life experience.
Natasha: Well, that's alright, you just make something up.
Steve: What, like you?
Natasha: I don't know. The truth is a matter of circumstances, it's not all things to all people all the time. And neither am I.
Steve: That's a tough way to live.
Natasha: It's a good way not to die, though.
Steve: You know, it's kind of hard to trust someone when you don't know who that someone really is.
Natasha: Yeah. Who do you want me to be?
Steve: How about a friend?
Natasha: Well, there's a chance you might be in the wrong business, Rogers.