In the back of my mind a warning bell was ringing.
3 seconds sound clip from the Invasion of the Body Snatchers (1956) movie soundboard.
You can hear this line at 00:14:05.643 in the Blu-ray version of the movie.
Quote context
[...]
- We better break this up or he'll start wondering.
- You've been a big help. I don't want you to worry about him me, or you either. I'll be alright.
- Staying here, Becky, or may I drive you home?
- Nice having Becky back again, eh, boy?
- Sure is.
- In the back of my mind a warning bell was ringing.
- Sick people who couldn't wait to see me then suddenly were perfectly alright.
- A boy who said his mother wasn't his mother.
- A woman who said her uncle wasn't her uncle.
[...]