- Uh, hadn't you better leave those lights on for your folks?
- I'll just turn them down dim.

7 seconds sound clip from the Meet Me in St. Louis (1944) movie soundboard.

You can hear this line at 00:40:55.620 in the DVD version of the movie.

Quote context

[...]

- No, it's here.

- Well, it certainly is dark in here with the lights off.

- It certainly is.

- Shall we do the dining room next?

- Yes.

- Say, that is a nice perfume.

- Do you like it?

- Uh-huh. It's essence of violet. I save it for special occasions.

- Exactly the kind my grandmother uses.

- There.

- I'll just turn these last two out.

- Uh, hadn't you better leave those lights on for your folks?

- I'll just turn them down dim.

- Gosh, Miss Esther. I hope I'm not too presumptuous. You don't need any beauty sleep.

- What a nice compliment.

- How does it go?

- How does what go? Over the banister leans a face tenderly sweet and, and...

- Beguiling while below her with tender grace, he watches the picture, smiling.

[...]