I don't even know what the fuck you're talking about.
4 seconds sound clip from the Taxi Driver (1976) movie soundboard.
You can hear this line at 00:48:58 in the Blu-ray version of the movie.
Quote context
[...]
- Another guy dies, another guy gets well, and people are born.
- I envy you, your youth. Go out and get laid. Get drunk. You know, do anything.
- You got no choice, anyway. I mean, we're all fucked. More or less, you know?
- I don't know. That's about the dumbest thing I ever heard.
- It's not Bertrand Russell, but what do you want? I'm a cabbie. What do I know?
- I don't even know what the fuck you're talking about.
- I don't know. Maybe I don't know either.
- Don't worry so much. Relax, Killer, you're gonna be all right.
- I know. I've seen a lot of people, and I know. Okay.
- Okay. Thanks, man. I'll see you. I guess...
- Yeah, you know. You're all right. You're all right.
[...]