- What did he mean?
- You know as much as I do.

4 seconds sound clip from the The Third Man (1949) movie soundboard.

You can hear this line at 00:35:33.133 in the Blu-ray version of the movie.

Quote context

[...]

- This forgery is very clever, and we are interested in this case.

- Have you arrested the girl?

- No, not yet.

- Please, keep this passport to yourself until I make some inquiries. Will you, Major?

- Yes, of course.

- Thank you.

- Right, sit down, Miss Schmidt. We'll send your letters and things back to you.

- And my passport?

- We'll need that for a while longer.

- What did he mean?

- You know as much as I do.

- Miss Schmidt, you were intimate with Lime, weren't you?

- We loved each other. Do you mean that?

- Do you know this man? I've never seen him. Joseph Harbin. He works in a military hospital.

- No.

- Joseph Harbin. He works in a military hospital.

- No.

- It's stupid to lie to me, Miss Schmidt. I'm in a position to help you.

[...]