- How many did he have?
- Just the one.
- Just the one? Come on, Doc.
- There's a fellow that can't hold his liquor.

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

You can hear this line at 01:18:48.399 in the DVD version of the movie.

Quote context

[...]

- 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.

- Here's to you, blacksmith.

- And to the future.

- Amen.

- Amen.

- Emmett, no!

- Doc! Doc! Doc! Come on, Doc. Wake up. Wake up, Doc!

- How many did he have?

- Just the one.

- Just the one? Come on, Doc.

- There's a fellow that can't hold his liquor.

- Get me some coffee. Black!

- Joey, coffee!

- How far does the 8:00 train go?

- San Francisco is the end of the line.

- I'll take a one-way ticket.

- You want to sober him up in a hurry, son, you're gonna have to use something a lot stronger than coffee.

- Yeah, what do you suggest?

- Joey, let's make some wake-up juice.

[...]