Listen, there are 100 billion stars in the galaxy, and not much space in the book.
4 seconds sound clip from The Hitchhiker's Guide to the Galaxy (1981) - Episode 1 sitcom.
You can hear this line at 00:31:18.104 in the Blu-ray version of the TV Series.
Quote context
[...]
- What about the book? Maybe the book's got something...
- It doesn't seem to have an entry!
- Yes, it does. At the bottom of the screen.
- Under 'Eccentrica Gallumbits, the triple-breasted whore of Eroticon 6.'
- Oh, yes. What's it say? 'Harmless'. Just one word? Harmless?
- Listen, there are 100 billion stars in the galaxy, and not much space in the book.
- And no one knew much about the Earth then, of course.
- Well, I hope you've managed to rectify that a bit.
[...]