Marty, I didn't mean to scare you. I didn't recognize you in those clothes.
4 seconds sound clip from the Back to the Future Part III movie soundboard.
You can hear this line at 01:44:30.552 in the DVD version of the movie.
Quote context
[...]
- Well, Doc, it's destroyed. Just like you wanted.
- Marty, I didn't mean to scare you. I didn't recognize you in those clothes.
- What the hell are you doing?
- Just putting on the second coat now.
- Come on, guys. We're gonna be late for brunch.
- Come on, Dad, we're not gonna hold your reservations all day.
- I can't find my glasses. Lorraine, have you seen my glasses?
- They're in your suede jacket, honey.
[...]