- How do you know about that?
- My father told me about it.
- Your father?
- Before he died.
- Yeah. Right.

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

You can hear this line at 00:57:28.370 in the Blu-ray version of the movie.

Quote context

[...]

- November 12, 1955. That was the date I went back... That was the date of the famous Hill Valley lightning storm.

- You know your history. Very good.

- I'll never forget that Saturday.

- I'd just picked my car up from the shop, 'cause I'd rolled it in a drag race a few days earlier.

- I thought you crashed into a manure truck.

- How do you know about that?

- My father told me about it.

- Your father?

- Before he died.

- Yeah. Right.

- So there I was, minding my own business.

- This crazy old codger with a cane shows up. He says he's my distant relative. I don't see any resemblance.

- So he says, 'How would you like to be rich?' So I said, 'Sure.' So he lays this book on me.

- He says this book will tell me the outcome of every sporting event till the end of the century.

[...]