Growing up, Kripke connected to television shows that had signature cars, such as "The Dukes of Hazzard" and "Knight Rider". This prompted him to include one in "Supernatural". "We say it's a modern American Western – two gunslingers who ride into town, fight the bad guys, kiss the girl and ride out into the sunset again. And we were always talking from the very beginning that if you're going to have cowboys, they need a trusty horse." He originally intended for the car to be a '65 Mustang, but his neighbor convinced him to change it to a '67 Impala, since "you can put a body in the trunk" and because "you want a car that, when people stop next to it at the lights, they lock their doors." Kripke has commented, "It's a Rottweiler of a car, and I think it adds authenticity for fans of automobiles because of that, because it's not a pretty ride. It's an aggressive, muscular car, and I think that's what people respond to, and why it fits so well into the tone of our show."