- Well, I don't doubt it.
- What do you mean, you don't doubt it?
- I was just kidding.

13 seconds sound clip from the Anna Christie (1930) movie soundboard.

You can hear this line at 00:53:22 in the DVD version of the movie.

Quote context

[...]

- Anybody else around? Here we go, boys.

- Why don't you test your lungs too.

- I should test them, with the fine bellows that I got?

- Well, try it.

- Faith, that's a woman's game. Not for a husky like me. You try it, Anna.

- No. You do it. I haven't got the wind in me that you have.

- Hand it over. Watch me. Sure, I've air enough in me chest to blow up a balloon.

- Well, I don't doubt it.

- What do you mean, you don't doubt it?

- I was just kidding.

- I bet he goes to 40. Oh, boy.

- Step up and roll the sweet mamas out of their beds. Make your own sweet mama jealous.

- Only 25 cents to see the most enchanting scene on Coney Island.

- Now there's Lily and Clytie without any nighties.

[...]