Well, that sounded final.
4 seconds sound clip from the Forbidden Planet (1956) movie soundboard.
You can hear this line at 01:21:57 in the Blu-ray version of the movie.
Quote context
[...]
- All right, get everything aboard ship. We're pulling out.
- Look, Doc, in case we make it into that lab, I'll take the first go at the IQ booster.
- I am monitored to admit no one at this hour.
- Maybe if we reasoned with him...
- My beams are focused on your blasters, gentlemen.
- Hasn't he got a built-in rule against wringing our little necks for us?
[...]