- What about a ham and cheese on whole wheat without any mustard?
- Ham and cheese, dark, save the mustard, coming up.

5 seconds sound clip from the The Best Years of Our Lives (1946) movie soundboard.

You can hear this line at 02:13:06.938 in the Blu-ray version of the movie.

Quote context

[...]

- That's the end of my career as a home wrecker.

- Mom, I know you feel sorry for me. You think my poor little heart is broken. But you can save your sympathy.

- I can see things clearer now. I made a fool of myself. I'm getting some sense hammered into me now.

- I'm glad I'm out of that mess. I'm glad I'll never see him again!

- Two chocolate sundaes coming up.

- What about a ham and cheese on whole wheat without any mustard?

- Ham and cheese, dark, save the mustard, coming up.

- Here you are.

- Thank you.

- Hello, Homer.

- Hi, Fred.

- How've you been? Glad to see you.

- Say, Fred.

- Yeah?

- What happened at Butch's?

- What do you mean?

[...]