You're right, Marty.

2 seconds sound clip from the Back to the Future Part III movie soundboard.

You can hear this line at 01:10:19.935 in the DVD version of the movie.

Quote context

[...]

- You know, it could still be you that gets shot tomorrow. This tombstone could still be in your future.

- Marty, the future isn't written. It can be changed. You know that. Anyone can make their future whatever they want it to be.

- I can't let this one little photograph determine my entire destiny.

- I have to live my life according to what I believe is right in my heart.

- Doc, you're a scientist. So you tell me what's the right thing to do up here!

- You're right, Marty.

- Wow, that worked great.

- I've at least got to tell her goodbye.

- Come on, Doc. Think about it. What are you gonna say to her? I've got to go back to the future? I mean, she's not gonna understand that, Doc. Hell, I'm in it with you, and I don't even understand it.

- Doc, listen. Maybe we I don't know, maybe we can just take Clara with us.

- To the future?

[...]