- I don't understand...
- Well, try a little harder.
- You don't know me, I'm very stupid.

6 seconds sound clip from the The Big Combo (1955) movie soundboard.

You can hear this line at 00:46:33.414 in the Blu-ray version of the movie.

Quote context

[...]

- This purchase was made in 1946.

- 1946! I'm sorry, I was not in business then. So I can't help you.

- I was hoping you'd have some record. It's... about the purchase of an anchor.

- I don't understand.

- In 1946, you were skipper of a private boat, bound from New York Harbor for Lisbon, Portugal. On the way you stopped at the Azores and bought a new anchor. Why?

- I don't understand...

- Well, try a little harder.

- You don't know me, I'm very stupid.

- The boat was a cabin cruiser owned by Grazzi. It's now being operated by a Mr. Brown.

- Do you know Mr. Brown?

- I had lunch with him last week. He's a very fine gentleman.

- He's a hoodlum.

- Because I have lunch with him, that is not a crime.

- I have lunch with anybody, I'm democratic. I'll even have lunch with you.

[...]