- Well, if you don't marry me, I'll tell.
- Tell what?

9 seconds sound clip from the The Curse of Frankenstein movie soundboard.

You can hear this line at 01:01:44.364 in the Blu-ray version of the movie.

Quote context

[...]

- Why choose me as the father? Pick any man in the village. The chances are it'll be the right one.

- She won't think so. Not when I tell her. And I'll tell her about what you're doing up in that laboratory of yours.

- And then I'll go to the authorities and tell them.

- Tell them what?

- Oh, I know plenty, if I care to tell.

- What do you know?

- You wouldn't like that, would you?

- Well, if you don't marry me, I'll tell.

- Tell what?

- You know what I'm talking about.

- Proof, my dear. That's all the authorities would be interested in. Proof.

- I want you out of this house by tomorrow morning.

- I'll get proof. Just you see. I'll get it.

[...]