Mental disorder

Movies that involve some form of mental disorder (focused on the multiple personality disorder) that I watched myself (and probably liked), and which do not make use of mystical factors. I am not including autism, as I am not convinced it should be considered mental, and not physical/neurological, disorder.
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1.
Identity (2003)
    1 2 3 4 5 6 7 8 9 10 7.3/10 X  
Stranded at a desolate Nevada motel during a nasty rain-storm, ten strangers become acquainted with each other when they realize that they're being killed off one by one. (90 mins.)
Director: James Mangold
 
2.
A Beautiful Mind (2001)
    1 2 3 4 5 6 7 8 9 10 8.2/10 X  
After John Nash, a brilliant but asocial mathematician, accepts secret work in cryptography, his life takes a turn for the nightmarish. (135 mins.)
Director: Ron Howard
 
3.
Fight Club (1999)
    1 2 3 4 5 6 7 8 9 10 8.8/10 X  
An insomniac office worker, looking for a way to change his life, crosses paths with a devil-may-care soap maker, forming an underground fight club that evolves into something much, much more. (139 mins.)
Director: David Fincher
 
4.
Secret Window (2004)
    1 2 3 4 5 6 7 8 9 10 6.6/10 X  
A writer is accused of plagiarism by a strange man, who then starts haunting him for "justice." (96 mins.)
Director: David Koepp
 
5.
Psycho (1960)
    1 2 3 4 5 6 7 8 9 10 8.5/10 X  
A Phoenix secretary embezzles $40,000 from her employer's client, goes on the run, and checks into a remote motel run by a young man under the domination of his mother. (109 mins.)
 
6.
The Lord of the Rings: The Two Towers (2002)
    1 2 3 4 5 6 7 8 9 10 8.7/10 X  
While Frodo and Sam edge closer to Mordor with the help of the shifty Gollum, the divided fellowship makes a stand against Sauron's new ally, Saruman, and his hordes of Isengard. (179 mins.)
Director: Peter Jackson
 
7.
The Lord of the Rings: The Return of the King (2003)
    1 2 3 4 5 6 7 8 9 10 8.9/10 X  
Gandalf and Aragorn lead the World of Men against Sauron's army to draw his gaze from Frodo and Sam as they approach Mount Doom with the One Ring. (201 mins.)
Director: Peter Jackson
“ The same character as in "The Two Towers" suffers from multiple personality disorder. ” - begy
 
8.
Shutter Island (2010)
    1 2 3 4 5 6 7 8 9 10 8.1/10 X  
In 1954, a U.S. marshal investigates the disappearance of a murderess who escaped from a hospital for the criminally insane. (138 mins.)
Director: Martin Scorsese
 
9.
Primal Fear (1996)
    1 2 3 4 5 6 7 8 9 10 7.7/10 X  
An altar boy is accused of murdering a priest, and the truth is buried several layers deep. (129 mins.)
Director: Gregory Hoblit
 
10.
X-Men: The Last Stand (2006)
    1 2 3 4 5 6 7 8 9 10 6.7/10 X  
When a cure is found to treat mutations, lines are drawn amongst the X-Men, led by Professor Charles Xavier, and the Brotherhood, a band of powerful mutants organized under Xavier's former ally, Magneto. (104 mins.)
Director: Brett Ratner
 
11.
Red Dragon (2002)
    1 2 3 4 5 6 7 8 9 10 7.2/10 X  
A retired FBI agent with psychological gifts is assigned to help track down "The Tooth Fairy", a mysterious serial killer; aiding him is imprisoned criminal genius Hannibal "The Cannibal" Lecter. (124 mins.)
Director: Brett Ratner
 
12.
Me, Myself & Irene (2000)
    1 2 3 4 5 6 7 8 9 10 6.5/10 X  
A nice-guy cop with dissociative identity disorder must protect a woman on the run from a corrupt ex-boyfriend and his associates. (116 mins.)
“ Quite a silly comedy, but had to include because of the subject matter. ” - begy
 
13.
Secret Beyond the Door... (1947)
    1 2 3 4 5 6 7 8 9 10 6.8/10 X  
When a lovely wife and her new husband, settle in an ancient mansion on the East coast, she discovers he may want to kill her. (99 mins.)
Director: Fritz Lang
 
14.
Pirates of the Caribbean: At World's End (2007)
    1 2 3 4 5 6 7 8 9 10 7.1/10 X  
Captain Barbossa, Will Turner and Elizabeth Swann must sail off the edge of the map, navigate treachery and betrayal, find Jack Sparrow, and make their final alliances for one last decisive battle. (169 mins.)
Director: Gore Verbinski
“ Captain Jack Sparrow starts exhibiting symptoms of multiple personality disorder after his visit to the world of dead. ” - begy
 
15.
Jekyll (2007 Mini-Series)
    1 2 3 4 5 6 7 8 9 10 8.2/10 X  
London, 2007. Tom Jackman is the only living descendent of Dr. Jekyll and Mr. Hyde. He has made a deal with his dark side: a body share... (334 mins.)
“ A very good "modernization" of the famous story about Dr. Jekyll and Mr Hyde. However, it is arguable if Dr. Jekyll (Jackman) and Mr. Hyde should be considered as a multiple personality disorder, since the transformation between them involves physical changes too. ” - begy
 
16.
Mary Reilly (1996)
    1 2 3 4 5 6 7 8 9 10 5.8/10 X  
A housemaid falls in love with Dr. Jekyll and his darkly mysterious counterpart, Mr. Hyde. (108 mins.)
Director: Stephen Frears
“ The same argument as in "Jekyll" is valid here. ” - begy
 
17.
Homeland (2011 TV Series)
    1 2 3 4 5 6 7 8 9 10 8.4/10 X  
A bipolar CIA operative becomes convinced a prisoner of war has been turned by al-Qaeda and is planning to carry out a terrorist attack on American soil. (55 mins.)
“ The female protagonist suffers from bipolar affective disorder. ” - begy
 
18.
Dexter (2006 TV Series)
    1 2 3 4 5 6 7 8 9 10 8.8/10 X  
Dexter Morgan is a Forensics Expert, a loyal brother, boyfriend, and friend. That's what he seems to be, but that's not what he really is. Dexter Morgan is a Serial Killer that hunts the bad. (53 mins.)
“ With a stretch, you could consider Dexter's "dark passenger" as his second [inner] personality. Even if not, the elements of full-blown sociopathy are there. ” - begy
 
19.
American Psycho (2000)
    1 2 3 4 5 6 7 8 9 10 7.6/10 X  
A wealthy New York investment banking executive hides his alternate psychopathic ego from his co-workers and friends as he delves deeper into his violent, hedonistic fantasies. (102 mins.)
Director: Mary Harron
 
20.
American Psycho II: All American Girl (2002 Video)
    1 2 3 4 5 6 7 8 9 10 3.9/10 X  
A girl named Rachael Newman has developed a taste for murder and will stand at nothing to become a college professor's assistant. (88 mins.)
 
21.
Amorous (2014)
    1 2 3 4 5 6 7 8 9 10 4.6/10 X  
Four fragile young people flee London to start an unconventional utopia, creating a world of fantasy that overwhelms them. (82 mins.)
Director: Joanna Coates