- What exactly do you plan to do about it?
- Plenty. I'm going to do just plenty.
- Don't you think it's about time you got started?

11 seconds sound clip from the Ocean's 11 (1960) movie soundboard.

You can hear this line at 00:40:35 in the Blu-ray version of the movie.

Quote context

[...]

- Let's saddle up. Let's go.

- I finally caught up with you. Where have you been for days and days?

- And what are you doing back with your wife?

- I know she was here, in this hotel with you, not more than an hour ago.

- You're two-timing me and I'm warning you, I'm one girl you can't treat this way. I won't be pushed around and neglected.

- What exactly do you plan to do about it?

- Plenty. I'm going to do just plenty.

- Don't you think it's about time you got started?

- Wait a minute, big buster!

- No, you wait a minute and listen to me very carefully, my dear.

- I picked you up at the Baltimore Bar because I thought you were attractive and I had nothing better to do and I made a pass at you for the very same reasons.

- I don't know your reasons were, but nobody twisted your arm, made you any promises. So what is this act? Not outraged virtue?

- You really are a rat.

[...]