- But why?
- Don't ask me. There's a good reason, and it's my wedding, so please.

7 seconds sound clip from the The Philadelphia Story movie soundboard.

You can hear this line at 00:22:16 in the Blu-ray version of the movie.

Quote context

[...]

- Well, it's tough, but that's the way it seems to be.

- So I'm to be examined, undressed and generally humiliated at 15 cents a copy. And you, you... you're loving it.

- Am I, Red?

- Well, Mother, we're hooked.

- Are they really reporters?

- Not even friends of Junius's?

- They aren't anybody's friends. But we're to pretend they are.

- But why?

- Don't ask me. There's a good reason, and it's my wedding, so please.

- I'll bet it's on account of Father and that dancer in New York.

- Dinah, what do you know?

- Oh, I listen around.

- Oh, dear, is there no such thing as privacy anymore?

- Only in bed, Mother, and not always there.

- Watching every little mannerism, jotting down notes on how we sit and stand and talk and eat and move.

- Will they do that?

- And all in that horrible, snide, corkscrew English.

[...]