Listen! Blackmail depends on secrecy.

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

You can hear this line at 00:24:26.223 in the Blu-ray version of the movie.

Quote context

[...]

- His secret? Haven't you guessed? He's the one who's blackmailing you.

- You bastard! Come on! Put 'em up!

- If you can't fight fairly, don't fight at all.

- Was that necessary, Mrs. White?

- Wait, wait! The police are coming.

- Listen! Blackmail depends on secrecy.

- You've all admitted how he's been able to blackmail you. All you have to do is tell the police, he'll be convicted and your troubles will be over.

- It's not so easy. You'll never tell the police.

- Then I shall.

- 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.

[...]