There's no real plot or anything to it, at least not until the end. It's just a guy driving a Mercedes-Benz 450SEL 6.9 around Paris with a camera strapped to the front of it. And it was very illegal.
With no permits or permission, you'll notice the driver eventually starts running red lights, heading down one-way streets and crossing traffic lines just for the hell of it.
Nobody knows who the man behind the wheel was, and there's even an urban legend that director Claude Lelouch was arrested after its first screening.
Whatever the truth, it's hard watching this and not reaching for a control pad...