Seems a lot has been going on that I know nothing about.

3 seconds sound clip from the Love Affair (1939) movie soundboard.

You can hear this line at 00:28:22.356 in the Blu-ray version of the movie.

Quote context

[...]

- Well, I saw Emile's entire family. Seven daughters. I congratulated him and I had a nice talk with his wife.

- How have you two girls been getting along?

- You'd be surprised.

- I bet she did all the talking.

- Mm-hmm.

- She told me that when you were a little boy, if you didn't get your own way, you used to lie on the floor, kick and get red in the face.

- What did you say?

- I said you didn't do that anymore. Now if you don't get your own way, you just get embarrassed.

- What have you two been discussing?

- Seems a lot has been going on that I know nothing about.

(SHIP HORN BLARES)

- Well, I'm afraid we must be going.

- See? Janou, you must play the piano for us before we go.

- She was a great pianist, you know. Come on, come on. She's going to play right now.

[...]