Darling, you mustn't worry so.
5 seconds sound clip from the Young Frankenstein (1974) movie soundboard.
You can hear this line at 01:29:57 in the Blu-ray version of the movie.
Quote context
[...]
- He will curse the day that he was born a Frankenstein!
- I said he will curse the day that he was born a Frankenstein.
- Loose! He's broken loose. Do you know what that means?
- Darling, you mustn't worry so.
- Now come along like a good boy.
- What would I do without you?
- Is your room just down the hall in case I get the frights during the night?
- Well, yes, but I thought perhaps tonight under the circumstances, I might stay here with you.
[...]