Natasha Romanoff: When I first joined SHIELD, I thought it was going straight. But I guess I just traded in the KGB for HYDRA. I thought I knew whose lies I was telling, but... I guess I can't tell the difference anymore.
Steve Rogers: There's a chance you might be in the wrong business.
Natasha Romanoff: [Smiles slightly] I owe you.
Steve Rogers: It's okay.
Natasha Romanoff: If it was the other way around, and it was down to me to save your life, and you be honest with me, would you trust me to do it?
Steve Rogers: I would now. And I'm always honest.
Natasha Romanoff: Well, you seem pretty chipper for someone who just found out they died for nothing.
Steve Rogers: Well, I guess I just like to know who I'm fighting.