- Why not?
- Why not? Why not? Don't you even know who my father is?

6 seconds sound clip from the Clueless (1995) movie soundboard.

You can hear this line at 00:41:12.688 in the Blu-ray version of the movie.

Quote context

[...]

- I'm having a Twin Peaks experience.

- I knew it. I knew when you kissed me.

- Suck and Blow is a game, Elton.

- No, it's not.

- Stop it!

- Fine. You know, I don't get you, Cher. I mean, you flirt with me all year.

- As if!

- I have been trying to get you together with Tai.

- Tai? Why would I go with Tai?

- Why not?

- Why not? Why not? Don't you even know who my father is?

- Uh. You are a snob and a half.

- Cher, listen to me. Me and Tai. We don't make any sense. Right? Me and you. Well, I mean, that makes sense.

- Cut it out!

- Come on, Cher.

- Stop it!

- Cher. Where you going? You're only hurting yourself here, baby. Come on.

[...]