- I put two and two together.
- And made five?
- Shall we say four and a half?

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

You can hear this line at 00:32:52.731 in the Blu-ray version of the movie.

Quote context

[...]

- 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?

- But you don't have to worry, Major. What I surmise I keep to myself.

- Well, I hope so, sir.

- Let me offer you a drink. Whiskey?

- Uh, yes, please. Straight.

- Barbara?

- Uh, no, thank you, Professor.

- I'll have the last chapter finished tomorrow.

[...]