- What are you going to do?
- I'm going to shoot you dead.

6 seconds sound clip from the The Seven Year Itch (1952) movie soundboard.

You can hear this line at 01:32:59 in the Blu-ray version of the movie.

Quote context

[...]

- There's a woman in this apartment. I just know there is.

- No, no, Helen. It's not true.

- Don't lie to me, Richard. Don't lie to me.

- Who told you? How did you know?

- Was it Kruhulik?

- That's right. I've had him watching you for months. His name is not Kruhulik. He happens to be a private eye named Johnny Dollar.

- What are you going to do?

- I'm going to shoot you dead.

- Helen, I can explain everything: the cinnamon toast, the shower, everything.

- You see, this girl's from Denver.

- Save your breath.

- The Kaufmans have no air-conditioning. Spent a fortune on African sculpture, but they didn't put in air-conditioning.

[...]