A nerdish boy buys a strange car with an evil mind of its own and his nature starts to change to reflect it.
Christine is, of course, utterly ridiculous. But I enjoyed it anyway. The movies have a love affair with cars, and at some dumb elemental level we enjoy seeing chases and crashes. In fact, under the right circumstances there is nothing quite so exhilarating as seeing a car crushed, and one of the best scenes in Christine is the one where the car forces itself into an alley that's too narrow for it.