- Why would I have murdered all the others?
- Obviously, in case Mr. Boddy had told them about you.

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

You can hear this line at 01:25:15.160 in the Blu-ray version of the movie.

Quote context

[...]

- So?

- You murdered them all.

- You were the person who was missing when the cook and Mr. Boddy were murdered, and the cook used to be your cook.

- Don't you remember your fatal mistake?

- You told us at dinner that we were eating one of your favorite recipes.

- And monkey's brains, though popular in Cantonese cuisine, are not often to be found in Washington, D.C.

- Is that what we ate?

- Why would I have murdered all the others?

- Obviously, in case Mr. Boddy had told them about you.

- So this all had nothing to do with the disappearing nuclear physicist and Colonel Mustard's work on the new fusion bomb.

- No. Communism was just a red herring.

- Mrs. Peacock did it all.

- There's no proof.

- Well, the gun is missing.

[...]