If not for that accident, your father's life would have turned out very differently. The man in the Rolls-Royce wouldn't have pressed charges, Marty wouldn't have broken his hand...
8 seconds sound clip from the Back to the Future Part II movie soundboard.
You can hear this line at 00:31:16.675 in the Blu-ray version of the movie.
Quote context
[...]
- Here.
- I'd be careful, old timer. This is a rough neighborhood.
- That accident caused a chain reaction that sent Marty's life straight down the tubes.
- I think the real reason your mother married him was because she felt sorry for him.
- Mom?
- Okay, I want channels 18, 24, 63, 109, 87 and the Weather Channel.
[...]