- Homework, Tannen?
- No, it ain't homework, 'cause I ain't at home.

Biff Tannen (Thomas F. Wilson)

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

You can hear this line at 01:18:02.561 in the Blu-ray version of the movie.

Quote context

[...]

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

- Is that liquor I smell, Tannen?

- I wouldn't know. I don't know what liquor smells like, 'cause I'm too young to drink it.

- I see. And what have we here?

- Sports statistics, interesting subject.

- Homework, Tannen?

- No, it ain't homework, 'cause I ain't at home.

- You've got a real attitude problem. You know that? Just watch it. Because one day, I'll have you right where I want you in detention. Slacker!

- Jesus, you smoke, too?

- Marty, you're beginning to sound just like my mother.

- Yeah, right.

- When I have kids, I'm going to let them do anything they want. Anything at all.

- Yeah, I'd like to have that in writing.

- Yeah, me, too.

- Marty, why are you so nervous?

[...]