I feel somewhat responsible for what happened.
3 seconds sound clip from the Back to the Future Part III movie soundboard.
You can hear this line at 00:44:47.694 in the DVD version of the movie.
Quote context
[...]
- Oh, no, that won't be necessary. I can take care of it. You've done more than enough already.
- Doc, she says it's fine, and we got to get going.
- Ma'am, good luck with your school teaching and everything.
- I feel somewhat responsible for what happened.
- Oh. That would be very gentlemanly of you, Mr. Brown. Emmett.
- Well, thank you for everything.
- I will see you again, won't I?
- Science? What sort of science? Astronomy? Chemistry?
- Actually, I'm a student of all sciences.
[...]