- Oh, tonight is the town festival. I wouldn't dream of having you work on my telescope during such an important occasion. You are planning on attending, aren't you?
- Well, actually, ma'am, I don't think...
- Yes, of course, the festival.

— Clara Clayton (Mary Steenburgen)

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

You can hear this line at 00:50:04.760 in the DVD version of the movie.

Quote context

[...]

- I would pay you, of course.

- Oh, no, no, no. I wouldn't think of charging you for this.

- Well, let's have a look at it.

- I think a lens may be out of alignment, because if you move it this way, the image turns fuzzy. See? But if you turn it the other way then...

- Everything becomes... clear.

(MARTY CLEARS THROAT)

- I could repair it right away and have it for you tonight.

- Oh, tonight is the town festival. I wouldn't dream of having you work on my telescope during such an important occasion. You are planning on attending, aren't you?

- Well, actually, ma'am, I don't think...

- Yes, of course, the festival.

- Well, in that case, I'll see you this evening at the festival, Emmett. Mr. Eastwood.

- Ma'am.

- Thank you for taking care of my telescope.

- You're quite welcome.

- It's a nice telescope.

- Ladies and gentlemen, as mayor of Hill Valley, it gives me great pleasure to dedicate this clock to the people of Hill County!

[...]