If you can't read the sign, Tannen, I presume you can read this.
4 seconds sound clip from the Back to the Future Part III movie soundboard.
You can hear this line at 00:55:12.114 in the DVD version of the movie.
Quote context
[...]
- Buford, you sure that blacksmith is gonna be at this here shindig?
- Sure he's here. Everybody's here tonight.
- You gentlemen will have to check your firearms if you want to join in on the festivities.
- Who's gonna make us, tenderfoot? You?
- I am.
- Marshal Strickland. I didn't know you was back in town.
- If you can't read the sign, Tannen, I presume you can read this.
- Pretty tough hombre when you're pointing a scatter gun at a man's back.
- Just like you, Tannen, I take every advantage I can get.
- Now you gonna check your iron?
[...]