Unhinged (2020)

A divorced mother honks impatiently at a deranged middle-aged stranger at a red light while running late on her way to work. His road rage escalates to horrifyingly psychotic proportions as he becomes single-mindedly determined to teach her a deadly lesson for provoking him.

Un giorno di ordinaria follia (1993)

An ordinary man frustrated with the various flaws he sees in society begins to psychotically and violently lash out against them.