It is, of course, well known that careless talk costs lives, but the full scale of the problem is not always appreciated.

— The Hitchhiker’S Guide To The Galaxy Book (Peter Jones)

7 seconds sound clip from The Hitchhiker's Guide to the Galaxy (1981) - Episode 4 sitcom.

You can hear this line at 00:20:00.679 in the Blu-ray version of the TV Series.

Quote context

[...]

- Now? To meet mice? You want me to meet mice now?

- It won't be a great social occasion, I'm afraid.

- Repeat, at once!

- I seem to be having this tremendous difficulty with my lifestyle.

- I beg your pardon?

- What? I'm sorry. Fatuous thing to say, really.

- I thought so.

- It is, of course, well known that careless talk costs lives, but the full scale of the problem is not always appreciated.

- For instance, at the very moment that Arthur said, 'I seem to be having this tremendous difficulty with my lifestyle'...

- A freak wormhole opened up in the fabric of the space-time continuum, and carried his words far back in time, across infinite reaches of space to a distant galaxy, where strange, war-like beings were poised on the brink of frightful interstellar battle.

- The two opposing leaders were meeting for the last time.

- And a dreadful silence fell across the conference table as the commander of the Vl'hurgs, resplendent in his red-jewelled battle shorts, gazed levelly at the G'Gugvunt leader squatting opposite him.

[...]