- When's he back?
- I don't know. He's left the school grounds on personal business.

— Grace (Edie McClurg)

8 seconds sound clip from the Ferris Bueller's Day Off movie soundboard.

You can hear this line at 00:46:11 in the Blu-ray version of the movie.

Quote context

[...]

- Plus, and I must be honest here, I love driving it. It is so choice. If you have the means, I highly recommend picking one up.

- Thank you.

- Yes, sir.

- Mint.

- Well, hello, Jeanie. Who's bothering you now?

- Is Mr. Rooney in?

- No, I'm sorry, he's not.

- Can I help you?

- I seriously doubt it.

- When's he back?

- I don't know. He's left the school grounds on personal business.

- What's that supposed to mean?

- I suppose it means it's personal and it's none of your business, young lady.

(JEANIE BUELLER SCOFFS)

- Nice attitude.

- Isn't Mrs. Hagel expecting you in consumer ed. class?

- Probably.

[...]