Mademoiselle, you are in Rick's and Rick is...
4 seconds sound clip from the Casablanca (1942) movie soundboard.
You can hear this line at 00:27:39 in the Blu-ray version of the movie.
Quote context
[...]
- Please, monsieur. It's a little game we play.
- They put it on the bill, I tear up the bill. It is very convenient.
- Captain, the boy who's playing the piano... Somewhere I've seen him.
- Sam?
- Yes.
- He came from Paris with Rick.
- Mademoiselle, you are in Rick's and Rick is...
- Is what?
- But what a fool I am talking to a beautiful woman about another man.
- Major.
[...]