And thereby introduced a revolutionary idea that children could punish their parents. Only when they deserved it, of course.

10 seconds sound clip from the Matilda (1996) movie soundboard.

You can hear this line at 00:11:04.814 in the Blu-ray version of the movie.

Quote context

[...]

- You're a little cheat. You saw the paper.

- From all the way over here?

- Are you being smart with me? If yo're being smart with me, young lady, you're gonna be punished.

- Punished for being smart?

- For being a smart aleck.

- When a person is bad, that person has to be taught a lesson.

- Person?

- Get up! Get up.

- Harry Wormwood had unintentionally given his daughter the first practical advice she could use.

- He meant to say, When a child is bad. Instead he said, When a person is bad.

- And thereby introduced a revolutionary idea that children could punish their parents. Only when they deserved it, of course.

- Michael, come in to my room.

- What?

- My boy, today's the day I take you to the shop. What do you say?

- I don't know. What do you say, Dad?

- I say appearance is nine-tenths of the law. People don't buy a car, they buy me. Which is why I personally take such pride in my appearance: well-oiled hair, clean shaved, snappy suit.

[...]