I came across No Country for Old Men on TV last night and watched it for a bit.
There's a scene where Tommy Lee Jones and his deputy are trying to reconstruct the events leading up to the shootout when the deputy says the following line as part of his recap.
"Gettin' set to trade. Then, whoooa, differences..."
It's not a plot-critical line, but it's not a throwaway line, either. (Full disclosure: I haven't read the book, so I don't know if the line appears in Cormac McCarthy's novel.)
But there's something about it that's just brilliant to me. Maybe it showed the young deputy's cynicism and coldness (which, sadly, he'd be needing in a world populated with folks like Anton Chigurh), compared to Tommy Lee Jones' character, who was struggling to keep up in a violent, lawless world that was nothing like the one he began his career in.
To me, it just reinforced the lesson we all know -- make every word in your story count.