Well, maybe it was a mistake, Doc. Maybe that grave wasn't yours. There could've been another Emmett Brown back in 1885. I don't know. Did you have any relatives here back then?
7 seconds sound clip from the Back to the Future Part III movie soundboard.
You can hear this line at 00:15:12.570 in the DVD version of the movie.
Quote context
[...]
- Does it mention me? Am I one of the 12?
- Look. William McFly and family. Your relatives?
- My great-grandfather's name was William. That's him. Good-looking guy.
- Then it is true, all of it. It is me who goes back there and gets shot.
[...]
