- Linda, will you be quiet?
- No, I'm having a swell time.

2 seconds sound clip from the Holiday (1938) movie soundboard.

You can hear this line at 00:26:17.960 in the Blu-ray version of the movie.

Quote context

[...]

- Old Judge Case's boy. White pillars. Guitars a-strumming. Evening, Massa.

- How you all, Miss Linda?

- Well, you must know some prominent people. Drop a few names.

- Oh, just casually.

- When I went to Mrs. Onderdonk's cockfight last Tuesday, whom should I see but Mrs. Marble. I thought I'd die laughing.

- Oh, Johnny, this is a lot of rot.

- Johnny, she says to me. She calls me Johnny.

- Linda, will you be quiet?

- No, I'm having a swell time.

- No, but this is terrible, sister.

- Do you realize that you're trying to marry into one of America's 60 families?

- When I find myself in a position like this, I ask myself, What would General Motors do? Then I do the opposite.

- As long as you don't stand up in front of Father and do a back flip-flop.

[...]