- Emmett, won't you come in?
- No, I better not. I...

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

You can hear this line at 01:12:17.993 in the DVD version of the movie.

Quote context

[...]

- I cautioned you about disrupting the continuum, for your own personal benefit. Therefore, I must do no less.

- We shall proceed as planned, and as soon as we return to 1985, we'll destroy this infernal machine.

- Traveling through time has become much too painful.

(KNOCKING ON DOOR)

- It's Emmett, Clara.

- Emmett, won't you come in?

- No, I better not. I...

- What's wrong?

- I've come to say goodbye.

- Goodbye? Well, where are you going?

- I'm going away. And well, I'm afraid I'll never see you again.

- Emmett!

- Clara, I want you to know that I care about you deeply.

- But I've realized that I don't belong here, and I have to go back where I came from.

[...]