You spy on me and I'll nail your slats to a tree.
3 seconds sound clip from the The Shootist movie soundboard.
You can hear this line at 00:22:36.842 in the DVD version of the movie.
Quote context
[...]
- All right. Just don't take too long to die. Be a gent and convenience everybody, and do it soon.
- You've worn out your welcome. Scat.
- The day they lay you away, what I'll do on your grave won't pass for flowers.
- You damn little sneak. How long were you out there?
- You spy on me and I'll nail your slats to a tree.
- Oh, no sir. No, I, I'd never...
- Oh, you've already told your mother. Who else have you blabbed to?
- I can't abide a skulker. You want to see me, knock on my door like a man.
- I will.
[...]