Oh, Monsieur Lecours, it's so simple.

2 seconds sound clip from the Phantom of the Opera (1943) movie soundboard.

You can hear this line at 00:55:42.365 in the Blu-ray version of the movie.

Quote context

[...]

- Christine DuBois goes back to the chorus and stays there for the two years my contract has to run.

- I won't permit it. I'll not stand for such an outrage. If any such arrangement is made, I'll...

- My dear Anatole, I have not finished.

- You suggest I forget I was drugged tonight, monsieur? Very well, I'll go a step further. I suggest that you forget anything happened afterwards.

- For once, madame, I do not understand.

- Oh, Monsieur Lecours, it's so simple.

- Nothing happened tonight. I wasn't drugged. And Christine DuBois didn't sing.

- But...

- Madame, there are always critics in the house.

- You'll send word to the paper that no mention of her is to be made.

- You'll do nothing of the sort. It's ridiculous.

[...]