- I apologize for the crudity of this model, but I just...
- Yeah, I know, Doc. It's not to scale. It's okay, Doc.

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

You can hear this line at 00:47:09.201 in the DVD version of the movie.

Quote context

[...]

- Let's just get the DeLorean ready, and get the hell out of here.

- I wish I'd never invented that infernal time machine. It's caused nothing but disaster.

- Doc, Doc, this is Marty. Do you read me? Over.

- Check, Marty.

- Great, Doc. These things still work.

- All right, Marty. Once more, let's go over the entire plan and layout.

- I apologize for the crudity of this model, but I just...

- Yeah, I know, Doc. It's not to scale. It's okay, Doc.

- All right. Tomorrow night, Sunday, we'll load the DeLorean onto the tracks here, on the spur right by the old abandoned silver mine.

- The switch track is where the spur runs off the main line three miles out to Clayton... Shonash Ravine.

- The train leaves the station at 8:00 Monday morning.

- We'll stop it here, uncouple the cars from the tender, throw the switch track, and then we'll hijack... borrow the locomotive and use it to push the time machine.

[...]