- Let us not talk here. May we use your room, sir?
- Yes, of course.

7 seconds sound clip from the The Pit and the Pendulum (1961) movie soundboard.

You can hear this line at 00:35:10 in the Blu-ray version of the movie.

Quote context

[...]

- He will sleep in a minute or so.

- Doctor, will you stay, please?

- Yes, of course, my dear. Until the morning, at any rate.

- My dear Lord.

- It is hers, isn't it?

- It is.

- But how?

- Let us not talk here. May we use your room, sir?

- Yes, of course.

- What I am about to tell you, no one in this world except Nicholas and myself knows. That is, I thought that no one else knew.

- Take this. Drink it.

- To be absolutely blunt about it, Nicholas believes that Elizabeth may have been interred prematurely.

- What?

[...]