- When you've finished your call, perhaps you'd be good enough to wait here.
- Certainly.

5 seconds sound clip from the Clue (1985) movie soundboard.

You can hear this line at 00:41:48.998 in the Blu-ray version of the movie.

Quote context

[...]

- I've an idea. We'll throw it away.

- Good idea! Wonderful! Right away! Brilliant! That'll do it!

- Sorry. Can we help?

- I'm sorry. I didn't mean to disturb the whole household, but my car broke down out here, and I was wondering if I could use your phone.

- Just a moment please.

- Very well, sir. Would you care to come in?

- Well, where is it?

- What, the body?

- The phone. What body?

- There's no body. Nobody. There's nobody in the study.

- No!

- But I think there's a phone in the lounge.

- Thank you.

- When you've finished your call, perhaps you'd be good enough to wait here.

- Certainly.

- Where's the key?

- In my pocket.

- Not that key. The key to the cupboard. With the weapons.

- Do you still wish me to throw it away?

- Yes!

- Well, what now?

- Wadsworth, let me out.

- No.

- Why not?

[...]