Something sentimental, I think.

4 seconds sound clip from the Breakfast at Tiffany's movie soundboard.

You can hear this line at 01:15:14 in the Blu-ray version of the movie.

Quote context

[...]

- Would you kindly lower your voice, miss?

- Why don't you autograph it to them? Don't you think it'd be nice? Sort of make it more personal?

- Really, miss...

- Go ahead. Don't be so stuck up, autograph it to them.

- All right, what shall I say?

- Something sentimental, I think.

- What are you doing? Stop that! You're defacing public property.

- Well, all right, if that's the way you feel.

- Come on, Fred, darling. Let's get out of here. I don't think this place is half as nice as Tiffany's.

- Hey, did you ever steal anything from a five-and-ten when you were a kid, I mean?

[...]