AllMovie

Fracchia (Paolo Villaggio) is a timid office worker whose life is turned upside-down when a maniacal killer is photographed and looks exactly like him -- unfortunately, the police do not usually hang around long enough to tell the difference between the pallid Fracchia and his double, the psycho murderer (the "human beast.") This leads to a merry chase around a hospital with the killer, Fracchia, and the police going around and around in a nearly senseless sequence. Hopefully, the police will straighten things out before Fracchia ends up on the wrong side of the prison walls.