Bloody Wednesday (1987) 
Offbeat psychological horror Bloody Wednesday tells the tale of Harry Curtis, a man who suffers a mental breakdown due to his wife leaving him. This in turn leads him to lose his job and get naked a lot.
He also starts to imagine things and concoct various scenarios in his head believing them to be real. As Harry's madness escalates his fantasies become increasingly more violent until they culminate at the film's bloody finale.
Bloody Wednesday, whilst flawed, is still a fun and engaging enough ride helped along considerably by Raymond Elmendorf as the troubled Harry.