- By the way, you always keep your door bolted at night, don't you?
- Not always.
- Be sure and lock it tonight, dear. Will you promise?
- If you say so.
- Good night.

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

You can hear this line at 00:39:36.959 in the Blu-ray version of the movie.

Quote context

[...]

- Think of what all those walls are hiding. Broken hopes and bodies and hearts. Absent dreams. Starvation, madness. Crimes of the streets. And tragedies of the river.

- Paris. My city.

- I hate to leave you alone tonight.

- Hold me tightly, Pierre.

- I could hold you forever, Camille.

- Good night, dear.

- Good night, Pierre.

- By the way, you always keep your door bolted at night, don't you?

- Not always.

- Be sure and lock it tonight, dear. Will you promise?

- If you say so.

- Good night.

- Good night, dear.

- Good night, mother.

(knocking on door) Pierre? -Yes.

- Mademoiselle, you will pardon the late hour. But I had to see you.

- What do you want, monsieur?

[...]