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

— Esther Smith (Judy Garland), John Truett (Tom Drake)

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

You can hear this line at 00:39:12.427 in the DVD version of the movie.

Quote context

[...]

- It's just that I... I'm afraid of mice.

- Well, sure, sure. That's the least a man can do for his charming hostess.

- I have to turn them out everywhere: in the dining room, and in the living room, and everywhere.

- Would you?

- Sure.

- 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.

[...]