Throw Momma from the Train

Throw Momma from the Train is a 1987 American black comedy film directed by and starring Danny DeVito in his directorial feature film debut. The film costars Billy Crystal, Rob Reiner, Anne Ramsey, Branford Marsalis, Kim Greist, and Kate Mulgrew appearing in supporting roles.

Novelist Larry Donner Billy Crystal struggles with writers block due to his resentment towards his exwife Margaret Kate Mulgrew, who stole his book and garnered mainstream success and critical acclaim with it. Owen Lift Danny DeVito is a timid, middleaged fellow who still lives with his overbearing, abusive and paranoid mother Anne Ramsey. Owen fantasizes about killing his mother but cant summon the courage to bring his desires into fruition. As a student in Larrys community college writing class, Owen is given advice by Larry to view an Alfred Hitchcock film to gain some insight into plot development for his mystery stories. He sees Strangers on a Train, in which two strangers conspire to commit a murder for each other, figuring their lack of connection to the victim will, in theory, establish a perfect alibi. Having overheard Larrys public rant that he wished his exwife dead, Owen forms a plan to kill Margaret, believing that Larry will, in return, kill his mother.He tracks Margaret down to Hawaii and eventually follows her onto a cruise ship she is taking to her book signing. He then apparently pushes her overboard while she tries to retrieve an earring that fell out. Owen returns from Hawaii to tell Larry of Margarets death and that Larry now owes him the murder of his mother, lest he inform the police that Larry was the killer. After having spent the night drinking alone during the hours of Margarets disappearance, Larry panics because he lacks a sufficient alibi. That, along with a news report announcing that the police suspect foul play, convinces Larry that hes the prime suspect. He decides to stay with Owen and his mother in an attempt to hide from the police. Larry meets Mrs. Lift, but despite her harsh treatment of him he refuses to kill her. Eventually, when Mrs. Lift drives Owen to breaking point, Larry finally relents and agrees to go through with the murder. ........

Source: Wikipedia