Now, really, Harry...
4 seconds sound clip from the Breakfast at Tiffany's movie soundboard.
You can hear this line at 00:03:40 in the Blu-ray version of the movie.
Quote context
[...]
- Hey, baby. What's going on here?
- Oh, hi.
- Miss Golightly. Some day... Some day... Miss Golightly.
- What happened to you, anyway? You take off for the powder room and that's the last I see you.
- Harry was the other guy. I'm Sid. Sid Arbuck.
- Oh, darling, I am sorry, but I lost my key.
[...]