Well, it was Waters idea originally.
4 seconds sound clip from the Champagne for Caesar movie soundboard.
You can hear this line at 01:21:56 in the DVD version of the movie.
Quote context
[...]
- Instead of sitting, may I lean?
- Now, there is no Stephen, is there? And you bought the roses for yourself.
- You're not neurotic, spellbound, in the grip of brutal men.
- I must congratulate you. To destroy me with such beautiful, torture, showed real genius.
- Well, it was Waters idea originally.
- Ah, but the execution was exquisite.
- Thank you, I did the worst I could.
- I remember the night you arrived. When I laughed in my sleep?
- It was effective, wasn't it?
- Were you also pretending when I kissed you?
[...]