Well, the thumb's an electronic sub-ether device, the roundabout's at Barnard's Star, but otherwise, that's more or less right.
6 seconds sound clip from The Hitchhiker's Guide to the Galaxy (1981) - Episode 1 sitcom.
You can hear this line at 00:19:49.388 in the Blu-ray version of the TV Series.
Quote context
[...]
- We're in a cabin in one of the spaceships of the Vogon constructor fleet.
- Ah. This is obviously some strange usage of the word 'safe' that I hadn't previously been aware of.
- Good grief! Is this really the interior of a flying saucer?
- Well, it's a bit squalid, isn't it?
- Oh, come on, let's get out of here.
- No, no, no. He just wants us to turn the lights out.
[...]