- Where's that punk Calvin Klein, anyway?
- How am I supposed to know? I ain't his secretary.

5 seconds sound clip from the Back to the Future Part II movie soundboard.

You can hear this line at 01:16:30.970 in the Blu-ray version of the movie.

Quote context

[...]

- Yes, well, I'm hoping to see some lightning tonight. Although, the weatherman says there's not gonna be any rain.

- There's going to be plenty of rain, all right. Wind, thunder, lightning. It's gonna be one hell of a storm.

- Well, thanks. Nice talking to you. Maybe we'll bump into each other some time again in the future.

- Or in the past.

(1946 Ford Tires Screeching)

- Doc, Doc! Come in!

- Where's that punk Calvin Klein, anyway?

- How am I supposed to know? I ain't his secretary.

- Well, go find him. He caused 300 bucks damage to my car, and I owe him a knuckle sandwich. Get going!

- Drink up, Biff.

- Yeah, thanks.

- Ain't you coming?

- I'm reading.

- Well, well, well, Mr. Tannen. How nice to see you here.

- Why, Mr. Strickland, it's nice to see you, sir.

[...]