- And then he... Guess what.
- I couldn't possibly.

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

You can hear this line at 01:30:02 in the Blu-ray version of the movie.

Quote context

[...]

- Wasn't it funny? It was sort of like as if you were coming from the pool.

- I'm going crazy. I'm standing here solidly on my own two hands and going crazy.

- Then what?

- Then after a while, I opened my door a crack, and there he was in the hall, still coming along with you, puffing like a steam engine.

- His wind can't be very good.

- Then what?

- Then you were sort of crooning.

- I never crooned in my life.

- I'm only saying what it sounded like.

- And then he... Guess what.

- I couldn't possibly.

- Then he just sailed right into your room with you, and that scared me, so I got up and went to your door and peeked in to make sure you were all right. And guess what.

- What?

- You were. He was gone by then.

- Gone? Of course he was gone. He was never there.

- I know, Tracy.

- Well, I should certainly hope you did.

- I'm certainly glad I do, because if I didn't, and in a little while, I heard the minister say, 'If anyone knows any just cause or reason why these two should not be united in holy matrimony,' I just wouldn't know what to do.

[...]