You thought high school romances were goofy and we started going together just because you thought I was kind of cute and funny, but then you suddenly realized you love me, it was serious, and you were leading up to something kind of big.

18 seconds sound clip from the American Graffiti movie soundboard.

You can hear this line at 00:05:12 in the Blu-ray version of the movie.

Quote context

[...]

- Hey, John. Someone new in town. You gonna go after him?

- Hey, listen, Professor. If he can't find me, then he ain't even worth racing, right?

- Big shot.

- Well?

- Where was I?

- You thought high school romances were goofy and we started going together just because you thought I was kind of cute and funny, but then you suddenly realized you love me, it was serious, and you were leading up to something kind of big.

- You make it sound like I'm giving dictation.

- Well, seriously, what I meant was that since we do care for each other so much, and since we should really consider ourselves as adults now, I... Could I have a couple of those fries?

- Where was I?

- 'Consider ourselves adults.' -Right. Right.

- I thought maybe, before I leave, we could agree that seeing other people while I'm away can't possibly hurt, you know?

[...]