[Marty and Jennifer are surprised at the Brown family's appearance]
Jennifer: Doctor Brown, I brought this note back from the future and now it's erased.
Doc: Of course it's erased!
Jennifer: But what does that mean?
Doc: It means your future hasn't been written yet. No one's has. Your future is whatever you make it, so make it a good one. Both of you.
Marty: We will, Doc!
Doc: Stand back! All right, boys, buckle up.
Marty: Hey, Doc! Where you going now? Back to the future?
Doc: Nope. Already been there.
Jennifer: Doctor Brown, I brought this note back from the future and now it's erased.
Doc: Of course it's erased!
Jennifer: But what does that mean?
Doc: It means your future hasn't been written yet. No one's has. Your future is whatever you make it, so make it a good one. Both of you.
Marty: We will, Doc!
Doc: Stand back! All right, boys, buckle up.
Marty: Hey, Doc! Where you going now? Back to the future?
Doc: Nope. Already been there.
[Marty and Jennifer are surprised at the Brown family's appearance]
Jennifer : Doctor Brown, I brought this note back from the future and now it's erased.
Doc : Of course it's erased!
Jennifer : But what does that mean?
Doc : It means your future hasn't been written yet. No one's has. Your future is whatever you make it, so make it a good one. Both of you.
Marty : We will, Doc!
Doc : Stand back! All right, boys, buckle up.
Marty : Hey, Doc! Where you going now? Back to the future?
Doc : Nope. Already been there.
http://www.moviequotedb.com/movies/back-to-the-future-part-iii/quote_43469.html