Now, now, better be quiet.
2 seconds sound clip from the Harvey (1950) movie soundboard.
You can hear this line at 00:58:50.419 in the Blu-ray version of the movie.
Quote context
[...]
- Oh, oh, oh, oh, oh! Oh, Doctor!
- Doctor, that is not my mother!
- Oh, I'm very glad to hear that.
- Elwood's been here. He's been here, Doctor!
- I'll take it. Hello? Yes? Yes. Who's calling?
- He's here! It's your brother!
- Now be careful. Don't let him know that I'm here. Be casual.
- Yes. Yes, I'll be casual. Yes. Yes.
- Hello, Elwood. Where are you, dear?
- I'm here, Veta. Is Harvey there?
[...]