I believe you're the sheriff.
4 seconds sound clip from the Tombstone (1993) movie soundboard.
You can hear this line at 00:49:58 in the Blu-ray version of the movie.
Quote context
[...]
- Yes, well, this happens to be a nocturne.
- A which?
- You know, Frederic fucking Chopin.
- Boy, I feel great. I feel just capital.
- Do you see what's going on in the street? Somebody's gotta do something.
- I believe you're the sheriff.
- No, no. This is not county business. This is a town matter. Marshal?
- Why don't you just leave it alone?
[...]