It's at the beginning of Back to the Future, about 20 minutes in, when Marty McFly first sees a futuristic four-wheeled hunk of metal—outfitted with a flux capacitor—back out of a smoke-filled trailer. Turning to the wild-haired Doc Brown, McFly exclaims, "Wait a minute, Doc. Ah... are you telling me that you built a time machine... out of a DeLorean?"