- All right, pops. What's the gag? How did you know what the score was gonna be?
- I told you. It's in this book.

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

You can hear this line at 01:09:40.059 in the Blu-ray version of the movie.

Quote context

[...]

- Don't you get it? You could make a fortune with this book. Let me show you.

- UCLA trails 17-16. It's 4th and 11 with only 18 seconds left of this game. I'd say it's all over for UCLA.

- Bet you a million bucks UCLA wins it 19-17.

- What are you, deaf, old man? He just said it was over. You lost.

- Oh, yeah?

- Here comes Decker with the kick. It's up. It looks good, folks! It looks very good. Field goal! UCLA wins 19-17. Listen to that Coliseum crowd go wild. Jim Decker...

- All right, pops. What's the gag? How did you know what the score was gonna be?

- I told you. It's in this book.

- All you gotta do is bet on the winner, and you'll never lose.

- All right. I'll take a look at it.

- You damn fool! Never, never leave this book laying around. Don't you have a safe? No, you don't have a safe. Get a safe. Keep it locked up. And until then, keep it on you like this.

- Hey, what are you doing?

[...]