An optional feature on the Molecular Mark IV is this seat for the mother-in-law.

8 seconds sound clip from The Jetsons - The Space Car (Season 1, Ep. 4) TV Series.

You can hear this line at 00:16:21 in the Blu-ray version of the movie.

Quote context

[...]

- Our research engineers are working constantly to develop new models.

- Watch as they transform this six-passenger capsule into a small sport model.

- Neat, huh?

- Sure saves a lot of time at the drawing board.

- Here at the proving ground, we see one solution to the problem of limited parking space.

- That's just what you need, dear.

- An optional feature on the Molecular Mark IV is this seat for the mother-in-law.

- Look out for that truck up ahead. Slow down, it's a red signal.

- Watch that rocket on your left.

- Shall we drop Mother off now, dear?

- Well, she's had lunch. Why wait?

- And furthermore, I don't know why you ever married him, Alice. You had so many better opportunities, like that nice professor, and that good-looking, young doctor and that smart architect!

[...]