- I'll ruin him if it's the last thing I do.
- You will not.

3 seconds sound clip from the Shockproof (1949) movie soundboard.

You can hear this line at 00:55:13.799 in the Blu-ray version of the movie.

Quote context

[...]

- Do you think I'm going to stand still while you make a fool of yourself over that Rover Boy, and then take you back when you come running to me again?

- I won't be coming back.

- You're so right, baby, because you're not walking out on me.

- Not for Griff Marat, not for him, not for that fool!

- I'm sorry, Harry. I didn't want it this way, but that's it.

- Do you think I give up this easily? Do you think I'm going to have people laughing at me?

- I'll ruin him if it's the last thing I do.

- You will not.

- I'm just starting to see you as you really are. You've always had to be the big shot, the powerful one, handing out favors. That's why you like doing things for me.

- You did all right.

- I didn't know any better then.

- Do you think you can do better with Griff Marat?

- Griff is decent, and he's smart, and he'll get places the right way.

[...]