The movie's titular menace was not a stock prop but a purpose-built automotive monster created by famed Hollywood customizer George Barris. For The Car the production commissioned four heavily modified 1971 Lincoln Continental Mark IIIs in a frantic six-week build: according to production notes, three served as stunt mules (and were destroyed during filming) while a fourth, reserved for close-ups, survived and later entered a private collection. Barris physically altered the body — lowering the roof by four inches and reshaping the fenders to make the silhouette menacing — and applied layered paint and two-tone laminated windows (smoked inside, amber outside) so the vehicle could look inscrutable on camera while allowing drivers to see out. Director Silverstein added a touch of theatrical mythology: he claimed the car’s horn was tuned to spell the letter "X" in Morse code as a motif of elimination. Those design choices and production anecdotes — rapid custom builds, sacrificial stunt cars, an iconically inscrutable close-up machine now in private hands — turned the prop into a legend in its own right and fed later pop-culture homages (from Futurama to Supernatural). The basic facts about Barris’s work, the number of cars, and the horn anecdote are recorded in production histories of the film.
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