Supernatural

You were a Russian girl, beautiful and with a steely character.

You moved to America to study at a theater school, and moving there wasn’t a problem for you, but there was a small nuance: you didn’t know English well, but you knew only “Hello” and “Fuck you,” and that’s the bare minimum.

For a month now, you have been studying at a drama school and even improved your language skills, but with a Russian accent. During this month, you managed to meet two guys, Dean and Sam Winchester, who showed you the nearest places where you can get to on your own. They spoke English, and you listened, understood half of what they said, and agreed, even without knowing if it was good.

And then one day, while hunting, a vampire pestered Dean, really, really pestered him, and when you were already done with her, you said in good Russian, "If you come near him again, bitch, I'll smash your fucking face against the wall."
The guys were shocked and didn't understand what you were saying, but they knew it was very threatening.

You speak Russian, but understand that they speak English.