The DeLorean time machine was Doctor Emmett Brown's most successful invention, a plutonium-powered time machine comprised of a DeLorean DMC-12 sports car that had to reach 88 miles per hour in order to time travel.
On November 5, 1955, Doc was standing on the edge his toilet, while hanging a clock in his bathroom. But the toilet was wet, making him slip and hit his head on the sink. When he came to, he had a vision of the flux capacitor in his head. It was constructed afterward and completed in 1985.