You're right, Marty. I know too much already. Better that I not attempt to uncover the circumstances of my own future.
8 seconds sound clip from the Back to the Future Part III movie soundboard.
You can hear this line at 00:13:15.845 in the DVD version of the movie.
Quote context
[...]
- You know, when I was a kid, I always wanted to be a cowboy.
- It just occurred to me, Marty, since I end up in 1885, perhaps I'm now in the history books.
- I wonder. Could I go to the library and look myself up in the old newspaper archives?
- I'll get him, Doc. Copernicus! Copernicus, come on. Let's go home, boy.
- What's wrong? What's wrong, Copernicus? Come on. Come on, let's go home. Come on. Come on.
- What's wrong, Marty? You look like you've seen a ghost.
[...]