You know, sir, that I would never deliberately insult you like that. I... I can't begin to tell you how embarrassed I am.

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

You can hear this line at 00:22:17 in the Blu-ray version of the movie.

Quote context

[...]

- I was wondering if it might be possible for my sister to bring home any assignments from my classes that I might need. Have a nice day.

- Mr. Peterson? I think I owe you an apology, sir.

- Well, I should say you do.

- I... I, I, I...

- Well, I think you should be sorry, for Christ's sake.

- A family member dies, and you insult me. What the hell is the matter with you anyway?

- Well... I really don't know, sir. I mean, I didn't think I was talking to you. I thought I was talking to somebody else.

- You know, sir, that I would never deliberately insult you like that. I... I can't begin to tell you how embarrassed I am.

- Pardon my French, but you're an asshole. Asshole!

- Absolutely right, sir. You've hit the nail right on the head.

- Find out where she is.

- This isn't over yet, buster. Do you read me?

- Loud and clear, Mr. Peterson.

[...]