What gave you that idea, sir?

1 seconds sound clip from the Fiend Without a Face (1958) movie soundboard.

You can hear this line at 00:32:38.890 in the Blu-ray version of the movie.

Quote context

[...]

- Oh, terrible tragedy. Really terrible.

- I need your help, professor.

- Anything you say. Just name it.

- This is the fourth death in the space of a few days. Not only are they terrible tragedies in themselves, but they're turning the townsfolk against us at the base.

- It's just ignorance, my dear fellow. These people are simple, one might say. Narrow in their outlook.

- Of course, the very secrecy of your activities doesn't help. This development of radar boosted by atomic power.

- What gave you that idea, sir?

- There was a piece in the Atom Journal about your work on reactors.

- It wasn't a year ago I read somewhere about the new radar patents.

- Of course, this territory is ideal for that kind of work.

- I put two and two together.

- And made five?

- Shall we say four and a half?

[...]