- Doc, what are you doing?
- Oh, nothing. I was just out enjoying the morning air. It's really lovely here in the morning. Don't you think?
- Yeah, it's lovely, Doc.

10 seconds sound clip from the Back to the Future Part III movie soundboard.

You can hear this line at 01:07:05.572 in the DVD version of the movie.

Quote context

[...]

- Go ahead, make my day.

- Say good morning, Mr. Eastwood.

- Morning.

- Have a cigar, Mr. Eastwood. Anything I can do for you today, Mr. Eastwood?

- No, that's fine.

- Good luck tomorrow, Mr. Eastwood. We'll be praying for you.

- Thanks.

- Good morning, Mr. Eastwood. Interest you in a new suit for tomorrow?

- I'm fine. Thanks.

- Doc, what are you doing?

- Oh, nothing. I was just out enjoying the morning air. It's really lovely here in the morning. Don't you think?

- Yeah, it's lovely, Doc.

- So listen, we've got to load the DeLorean up, and get ready to roll, all right?

- Hey, look at that, the tombstone.

- Marty, let me see that photograph again.

- My name, it's vanished.

[...]