Tetsuo: The Iron Man

A man (called only "the man", or the "Metal Fetishist"), cuts open a massive gash in his leg and then shoving a large threaded steel rod into the wound. Later, upon seeing maggots festering in the wound, he screams, runs out into the street, and is hit by a car. The driver of the car, a Japanese businessman, and his girlfriend try to cover up the mess by dumping the body into a ravine, but the dumped man gets revenge by forcing the businessman's body to gradually metamorphose into a walking pile of scrap metal. This process starts when the driver finds a piece of metal stuck in his cheek while shaving. He tries to remove it, but realizes it is growing from the inside.