It could be anybody, of course, but what crossed my mind was... suppose Bill's having us watched, huh?
9 seconds sound clip from the Breakfast at Tiffany's movie soundboard.
You can hear this line at 00:44:33 in the Blu-ray version of the movie.
Quote context
[...]
- See if who's still there? What are you talking about?
- Look.
- See? I noticed him yesterday afternoon.
- I didn't say anything, I didn't want to sound neurotic, but when he's there again today...
- Okay, I'll take care of this.
- Look, if that's what it is, you'll only make everything worse.
- I'll be careful. You wait here.
- Darling, please don't. I don't think you should.
[...]