- "He [Doc] took the toy car and wound it up. / "You'll be in this," he said [to Marty]. "Now, on a signal, you'll take off down the street toward the cable, accelerating until you hit eighty-eight miles an hour..." / He released the toy car from one end of the model. It raced toward the strung wire. Picking up a stripped wire that was plugged into an AC outlet, he brought it towards the "lightning rod" nail [on the model courthouse]. / "Then," he continued, "lightning strikes, electrifying the cable, just in time to..." / With that, he touched the live wire to the nail. As the toy car's antenna snagged the cable, sparks flew, the car caught fire and sailed off the table top. Striking the drapes nearby, it rolled down them, spreading flames as it went. In a split second, the cheap curtains were a mass of flames and smoke. / Doc Brown rushed to the far end of the room, grabbed a fire extinguisher and had the blaze under control in less than a minute."
- —From Back to the Future by George Gipe (quote, page 184)
A fire extinguisher was a piece of apparatus used for fighting a fire.
On November 7, 1955, Doc demonstrated to Marty McFly with the aid of a large model of Hill Valley's Courthouse Square his method of getting the DeLorean time machine to travel through time back to 1985.
Unfortunately, the demonstration went somewhat amiss when the windup toy car used to represent the DeLorean caught fire when Doc timed the 'lightning' with its intersection of the cable and caused an explosion on the model table. The burning car shot straight off the end of the table, along the floor and towards a large cloth on the other side of the garage, setting it ablaze. Doc quickly grabbed the extinguisher and put the fire out.
Behind the scenes
- George Gipe changed this scene slightly for the novelization (see Quote above), in which the burning toy car strikes and sets fire to a pair of curtains nearby rather than rolling along the floor and setting a large cloth alight as occurs on-screen.