And you also knew her, sir. We've already established that you were one of Miss Scarlet's clients.
5 seconds sound clip from the Clue (1985) movie soundboard.
You can hear this line at 01:13:07.308 in the Blu-ray version of the movie.
Quote context
[...]
- You recognized Yvette, didn't you? Don't deny it.
- What do you mean don't deny it? I'm not denying anything.
- You knew Yvette, too, didn't you?
- And you also knew her, sir. We've already established that you were one of Miss Scarlet's clients.
- Mr. Boddy threatened to send those pictures to my dear old mother. The shock would've killed her.
- That would've been quite an achievement, since you told us that she's dead already.
- But where and when was Mr. Boddy killed?
[...]