Listen. The crickets have stopped. We don't know when they change back to... whatever they really are.
11 seconds sound clip from the X Minus 1 - Mars is Heaven by Ray Bradbury classic radio dramaseries.
You can hear this line at 00:24:05 in the radio play.
Quote context
[...]
- Do you think there's something to this?
- It's a perfect trap, Captain.
- Who would suspect his own mother? His grandparents?
- How easy. Just a knife in the heart of each sleeping man.
- That's impossible, but we've got to get back to the ship.
- Careful.
- Ed. We, uh, we wanted a drink of water, that's, that's all Ed.
[...]