I don't think it does scare them. It hurts them.
2 seconds sound clip from the Tremors (1990) movie soundboard.
You can hear this line at 01:19:12.438 in the Blu-ray version of the movie.
Quote context
[...]
- Here they come. They're coming back!
- We'll have to make a run for those rocks.
- I don't know, Val. That's a hell of a long way.
- They're sure as hell gonna get us if we stay here.
- Hey, Burt! You have any more of those bombs?
- We've got you covered, Rhonda.
- What if they don't get scared? What if they don't run?
- I don't think it does scare them. It hurts them.
- They're so sensitive to sound, they gotta run.
- Oh, hell, she's got my vote!
- That's it! We're making a run for it! We're going for the rocks.
- I don't know, man. They're too fast. You can't outrun them. No way!
- Yo, Melvin. This'll make them think twice.
[...]
