- Marty, you're acting like you haven't seen me in a week.
- I haven't.

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

You can hear this line at 00:00:59.390 in the Blu-ray version of the movie.

Quote context

[...]

- How about a ride, mister?

- Oh, man, are you a sight for sore eyes! Let me look at you.

- Marty, you're acting like you haven't seen me in a week.

- I haven't.

- Are you okay? Is everything all right?

- Oh, yeah. Everything's great.

(EXPLOSIVE CRASHING, DELOREAN TIRES SCREECHING)

- Marty! You've got to come back with me!

- Where?

- Back to the future.

- Wait a minute. What are you doing, Doc?

[...]