I told you to watch your back, smithy.

2 seconds sound clip from the Back to the Future Part III movie soundboard.

You can hear this line at 00:57:34.930 in the DVD version of the movie.

Quote context

[...]

- Hey, that's mine!

- Not anymore. Give me that.

- There he is, Buford.

- Where?

- There. Dancing with that piece of calico.

- What are you gonna do, boss?

- I figure if I bury this muzzle deep enough in his back, nobody will hear the shot.

- Careful, Buford. You ain't got but one bullet with that.

- I only need one.

- I told you to watch your back, smithy.

- Tannen, you're early.

- It's a Derringer, smithy. Small but effective. The last time I used it, fellow took two whole days to die. Bled to death inside. It was real, real painful.

- That means you'll be dead by about supper time Monday.

- Excuse me. I don't know who you think you are, but we're dancing.

[...]