- We didn't know we were meeting you tonight. Did you know you were meeting us?
- Oh, yes.

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

You can hear this line at 00:25:20.361 in the Blu-ray version of the movie.

Quote context

[...]

- I have evidence in my possession. And this conversation is being tape recorded.

- Point of order. Tape recordings aren't admissible evidence.

- Ladies and gentlemen, the police will be here in about 45 minutes. Tell them the truth, and Mr. Boddy will be behind bars.

- Where are you going this time?

- I think I can help them make up their minds.

- Can I just get my little bag from the hall?

- Who can guess what's in here?

- The evidence against us, no doubt.

- We didn't know we were meeting you tonight. Did you know you were meeting us?

- Oh, yes.

- What were you told, precisely?

- Merely, that you were all meeting to discuss our little financial arrangements.

- And if I didn't appear, Wadsworth would be informing the police about it all.

- Naturally, I could hardly resist putting in an appearance.

- Excuse me.

[...]