That way, we don't risk anyone else stealing the time machine, and I won't risk accidentally running into my other self.
8 seconds sound clip from the Back to the Future Part II movie soundboard.
You can hear this line at 01:03:18.303 in the Blu-ray version of the movie.
Quote context
[...]
- Once Old Biff is gone, grab the almanac any way that you can.
- Remember, both of our futures depend on this.
- You don't have to remind me of that, Doc.
- Here's some binoculars and a walkie-talkie so we can keep in contact.
- I'll stay here and try to repair the short in the time circuit.
- Yes. There are now two of me here, and there are two of you here.
- Remember the lightning bolt at the clock tower?
- Yeah.
[...]