So there I was, minding my own business.

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

You can hear this line at 00:57:41.091 in the Blu-ray version of the movie.

Quote context

[...]

- 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.

- All I have to do is bet on the winner, and I'll never lose.

[...]