Happy trails, Marty!
2 seconds sound clip from the Back to the Future Part III movie soundboard.
You can hear this line at 00:18:11.641 in the DVD version of the movie.
Quote context
[...]
- Wait a minute. Doc, if I drive straight towards the screen, I'm gonna crash into those Indians.
- Marty, you're not thinking fourth-dimensionally.
- You'll instantly be transported to 1885, and those Indians won't even be there.
- Right.
- Well. Good luck for both of our sakes.
- Exactly.
- Ready!
- Set!
[...]