Forget it, Emil. Mistakes like that happen all the time.
4 seconds sound clip from the Casablanca (1942) movie soundboard.
You can hear this line at 00:17:15 in the Blu-ray version of the movie.
Quote context
[...]
- A gentleman inside has won 20000 francs and the cashier would like some money.
- I'm so upset, Rick. You know I...
- Forget it, Emil. Mistakes like that happen all the time.
- Rick, there's gonna be some excitement here tonight.
- We're gonna make an arrest in your café.
- Again?
- This is no ordinary arrest. A murderer, no less.
[...]