What makes you think I haven't?
3 seconds sound clip from the Casablanca (1942) movie soundboard.
You can hear this line at 00:10:02 in the Blu-ray version of the movie.
Quote context
[...]
- Your cash is good at the bar.
- I do. You're lucky the bar is open to you.
- This is outrageous! I shall report it to The Angriff.
- What makes you think I haven't?
- Nothing.
- But when you first came to Casablanca, I thought...
- What right do I have to think?
- May I?
[...]