Don't try and put me off. I know too much.

4 seconds sound clip from the The Skin Game (1931) movie soundboard.

You can hear this line at 01:13:53 in the Blu-ray version of the movie.

Quote context

[...]

- There's somebody at the door! I must go.

- Oh, I forgot. It's locked.

- Is my wife here?

- No, sir.

- Has she been here?

- This morning, I believe. Jill?

- Yes, she came this morning.

- I know that. Now, I mean.

- Now?

- Tell me what was said this morning.

- I wasn't here this morning.

- Don't try and put me off. I know too much.

- Shall I go, dad?

- No, I will.

- Won't you sit down?

- No.

- Well, it appears that my agent happens to know the firm who in the old days employed your wife.

- I should greatly prefer not to say anymore, especially as we don't believe the stories.

- No, we don't.

[...]