It's a sort of threat, you see. I've never been terribly good at them myself, but I'm told they can be terribly effective.
6 seconds sound clip from The Hitchhiker's Guide to the Galaxy (1981) - Episode 3 sitcom.
You can hear this line at 00:24:57.313 in the Blu-ray version of the TV Series.
Quote context
[...]
- On second thought, leave it here.
- 'Bring it, leave it'... I think I 'll turn myself off.
- You must come with me. Great things are afoot.
- Come, come now, or you'll be late.
- Dent, Arthur Dent. Late, as in the late Dent, Arthur Dent.
- What an extraordinary person.
- Nothing.
- Excuse me, what is your name, by the way?
- My name? My name is Slartibartfast.
[...]