- How do you know that?
- Instinct.
- But the facts...

4 seconds sound clip from the A Shot in the Dark (1964) movie soundboard.

You can hear this line at 00:24:55.921 in the Blu-ray version of the movie.

Quote context

[...]

- Have testified that Miguel Ostos beat Maria Gambrelli frequently.

- And, now, finally comes the sworn statement of Monsieur and Madame Ballon, as well as all the members of the staff, each of them with perfect alibis.

- Now then, Hercule, what is the inescapable conclusion?

- Maria Gambrelli killed the chauffeur.

- What? You idiot. Impossible. She's protecting someone.

- How do you know that?

- Instinct.

- But the facts...

- You are forgetting the most important fact. Motive.

- He beat her.

- He was Spanish.

- He tore her dress off.

- Don't be ridiculous. Would you kill somebody who tore your dress off?

- No, I suppose not.

- No, of course not.

- No, no. There is no doubt in my mind whatsoever, Hercule.

[...]