They're stuck with each other and they've got to ride all the way to the end of the line. And it's a one-way trip, and the last stop is the cemetery.
7 seconds sound clip from the Double Indemnity movie soundboard.
You can hear this line at 01:23:12 in the DVD version of the movie.
Quote context
[...]
- Now, we know the Dietrichson dame is in it, and a somebody else.
- Pretty soon we'll know who that somebody else is. He'll show. He's got to show.
- She put in her claim. I'm gonna throw it right back at her.
- Let her sue us if she dares. I'll be ready for her and that somebody else.
- They'll be digging their own graves.
[...]