- "Leaving the latest of his inventions [the brain-wave analyzer] on his head, he [Doc] got up and paced. Where had he gone wrong? Was it the machine or himself? A slight twinge of pain in his head reminded him that the fault could be in his own mind. That morning, while hanging a clock in the bathroom, he had fallen from the toilet and sustained a violent knock to the skull. The brain being being a complicated mass of electrical impulses and energy, it was indeed possible that the blow had caused a short circuit powerful enough to make his tests invalid."
- —From Back to the Future by George Gipe (quote, pages 113 and 114)
- " Racing after Doc Brown, he [Marty] began to speak in a rapid-fire patter. "Doctor Brown, listen to me!" he said. "That bruise on your head — I know you got it! It happened this morning! You were hanging a clock and fell off your toilet and hit your head on the sink..." / Doc Brown whirled to look at him. / "What have you been doing — spying on me?" he demanded. "Haven't I even got privacy in the bathroom? When I sit down now, do I have to worry about some idiot with binoculars looking at me?" / "No," Marty assured him. "I didn't spy on you. In 1985, you told me about this morning. You said after the fall, you had a sort of vision about the flux capacitor, which is the heart of the time machine." "
- —From Back to the Future by George Gipe (quote, page 119)
A toilet was a device upon which an individual could deliver personal waste to either a septic tank or a sewer system.
On November 5, 1955, Dr. Emmett Brown was hanging a clock while standing on his toilet. The porcelain on the toilet was wet and he slipped, hitting his head on the sink. When he came to, he had a vision of his flux capacitor and drew up a schematic diagram of what would become the key to making time travel possible.
Behind the scenes
- The toilet from which Doc fell is later seen in Doc's mansion when Marty returns to 1955 for the second time.