I wonder...
4 seconds sound clip from the The Tingler (1959) movie soundboard.
You can hear this line at 00:35:48 in the Blu-ray version of the movie.
Quote context
[...]
- I mean it. Take the night off.
- He's leaving us out of something.
- But what? There's nothing in the lab.
- It's not a drug. It's an acid.
- Locked. He never did that before.
- He's locking the other door.
[...]