- Do you speak Italian?
- No.
- Were you ever in Italy?
- No.
- How do you know it was Italian?
- Because I am sure it was Italian.

18 seconds sound clip from the Murders in the Rue Morgue (1932) movie soundboard.

You can hear this line at 00:48:38.274 in the Blu-ray version of the movie.

Quote context

[...]

- I am Franz Odenheimer. I own a restaurant.

- In your own way, tell us what happened.

- You see, I was just going to bed. Then suddenly, I heard a scream. Right away, I ran across the street.

- And I was one of the first ones to enter this room.

- On the way upstairs, I heard a voice. And that voice was speaking Italian.

- Do you speak Italian?

- No.

- Were you ever in Italy?

- No.

- How do you know it was Italian?

- Because I am sure it was Italian.

- What do you know of this affair?

- Well, I also heard the voice. But it was not Italian. I'm Italian. I speak Italian. Io parlo italiano.

- When I ran up the stairs with the others, I heard the voice. It's not Italian, no. It was Danish.

- Do you speak Danish?

- No.

- Were you ever in Denmark?

- No.

- How do you know it was Danish?

- My intuition.

[...]