Don't you talk like that, dear.
2 seconds sound clip from the Robot Monster (1953) movie soundboard.
You can hear this line at 00:19:47.645 in the Blu-ray version of the movie.
Quote context
[...]
- If we only could find a way, only one way of communication with each other.
- Do you think we still have a garrison on the space platform? Ro-Man hasn't destroyed that yet.
- Well... It could be. If we only could get through to them.
- But why should we succeed where others failed?
- Don't you talk like that, dear.
(intense tone whistling and buzzing)
- This may be them! Maybe they are coming through from the space platform.
- Now I know you are watching. I see five of you who have not been destroyed.
[...]