Alfred, please inform Mrs. Cooper that we maybe late for supper this evening.

7 seconds sound clip from Batman (1966) - True or False Face (S1E17) TV Series.

You can hear this line at 00:16:37 in the Blu-ray version of the movie.

Quote context

[...]

- This paper is made by a top secret government process indeed... only a few people outside the official bank note printing company are aware that it's the only paper that cannot be counterfeited.

- Uh-huh!

- You found something?

- The solution, sir?

- The size... the material it all fits. This is official bank note paper.

- False Face must have penetrated the official bank note printing company.

- And if he has plans of counterfeiting, I'll bet he'll go back there for more special paper.

- But we will be there before he is. To the Batmobile.

- Alfred, please inform Mrs. Cooper that we maybe late for supper this evening.

- There's nobody here.

- Not so far. But if someone should arrive, I think we should be out of sight.

- Excuse me, do you have a light?

- Why, certainly. But smoking is forbidden in the bank note paper room.

- What department are you in, miss?

- Removal.

- You see, my curious friend, we need this paper.

[...]