But if I know Tracy, and I know her well, she'll remember little of this.

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

You can hear this line at 01:22:38 in the Blu-ray version of the movie.

Quote context

[...]

- Hello, George.

- Hello, Mike.

- Second door to the right, top of the stairs. And mind you don't wake Dinah.

- My feet are made of clay. Made of clay. Did you know? Good night, little man.

- How are the mighty fallen.

- But if I know Tracy, and I know her well, she'll remember little of this.

- For the second time in her life, she'll draw quite a tidy blank.

- You don't believe it then?

- Believe what?

- Well, the implications of what you saw, let us say.

- Well, what else am I to believe?

- That's entirely up to you.

- I got eyes, I got imagination, haven't I?

- I don't know. Have you?

- Oh, so you pretend not to believe it?

- Yes, I pretend not to.

[...]