And this is temporal experiment number one.
4 seconds sound clip from the Back to the Future movie soundboard.
You can hear this line at 00:19:47 in the Blu-ray version of the movie.
Quote context
[...]
- Never mind that now. Never mind that now. Not now. Not now.
- Good evening. I'm Dr. Emmett Brown. I'm standing on the parking lot at Twin Pines Mall.
- It's Saturday morning, October 26, 1985, 1:18 a.m..
- And this is temporal experiment number one.
- Please note that Einstein's clock is in precise synchronization with my control watch.
- Got it?
- Have a good trip, Einstein. Watch your head.
[...]