- How much has he had?
- None. That's the first one, and he hasn't touched it yet. He just likes to hold it.

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

You can hear this line at 01:17:52.552 in the DVD version of the movie.

Quote context

[...]

- It's still early, boss. What's your hurry?

- I'm hungry.

- And in the future, we don't need horses. We have motorized carriages called automobiles.

- If everybody's got one of these auto whatsits, does anybody walk or run anymore?

- Of course we run, but for recreation, for fun.

- Run for fun? What the hell kind of fun is that?

- Doc! Doc!

- How much has he had?

- None. That's the first one, and he hasn't touched it yet. He just likes to hold it.

- Doc! Doc! What are you doing?

- I've lost her, Marty.

- There's nothing left for me here.

- All right, that's why you gotta come back with me.

- Where?

- Back to the future!

- Right! Let's get going! Gentlemen, excuse me, but my friend and I have to catch a train.

[...]