- Only I wonder what this might be.
- It looks terribly like a wristwatch.
- But whose? I found it in my room. I nearly stepped on it.

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

You can hear this line at 01:27:42 in the Blu-ray version of the movie.

Quote context

[...]

- Aren't you here early, Uncle Willie?

- It's nearly half past 12:00!

- Well, it can't be.

- Where's Mother?

- She's talking with the orchestra. Father with the minister.

- And Mr. Connor, he hasn't come down yet.

- Mmm. And it's Saturday, your wedding day. Remember?

- Thanks loads. It's nice to have things accounted.

- Only I wonder what this might be.

- It looks terribly like a wristwatch.

- But whose? I found it in my room. I nearly stepped on it.

- Also, I think I was robbed at your house last night, Uncle Willie. My bracelet and engagement rings are missing.

- Here you are.

- But you weren't at the party.

- Wasn't I?

- Were you?

- Oh, now don't tell me you don't remember.

- I do, now. Sort of, but there were such a lot of people. I stayed so late.

- Oh, you should've taken a quick swim when you got home.

- A swim? A swim?

- There. Now they're open.

[...]