Marty, you're not thinking fourth-dimensionally.
— Dr. Emmett Brown (Christopher Lloyd)
4 seconds sound clip from the Back to the Future Part III movie soundboard.
You can hear this line at 00:17:44.981 in the DVD version of the movie.
Quote context
[...]
- September 2nd, 1885, 8:00 a.m.
- I get shot on Monday the 7th, so you have five days to locate me.
- According to my letter, I'm a blacksmith, so I probably have a shop somewhere.
- 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.
[...]