The Best "Thinker" Movies

A list of my favourite type of movie, The Thinker. Movies that you have to be totally engrossed in to try and understand. Movies that will keep you constantly searching for the meaning and answers to the movie and keep you guessing about what's happening right until the last moments. Not necessarily twist endings, but genuinely great stories

Not in a particular order, just how they came to me.
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1.
La moustache (2005)
    1 2 3 4 5 6 7 8 9 10 6.7/10 X  
Marc is sitting in his bath one morning and asks his wife, "how would you feel if I shaved off my mustache?" She doesn't think it's a great idea... (87 mins.)
 
2.
Primer (2004)
    1 2 3 4 5 6 7 8 9 10 7.0/10 X  
Four friends/fledgling entrepreneurs, knowing that there's something bigger and more innovative than the different error-checking devices they've built, wrestle over their new invention. (77 mins.)
Director: Shane Carruth
 
3.
2001: A Space Odyssey (1968)
    1 2 3 4 5 6 7 8 9 10 8.3/10 X  
Humanity finds a mysterious, obviously artificial object buried beneath the Lunar surface and, with the intelligent computer H.A.L. 9000, sets off on a quest. (149 mins.)
Director: Stanley Kubrick
 
4.
Catfish (2010 Documentary)
    1 2 3 4 5 6 7 8 9 10 7.1/10 X  
Young filmmakers document their colleague's budding online friendship with a young woman and her family which leads to an unexpected series of discoveries. (87 mins.)
 
5.
Intacto (2001)
    1 2 3 4 5 6 7 8 9 10 6.9/10 X  
An enigmatic tale of four incredibly lucky people whose lives are intertwined by destiny are subject to the laws of fate... (108 mins.)
 
6.
Hollywoodland (2006)
    1 2 3 4 5 6 7 8 9 10 6.5/10 X  
A detective examines the mysterious death of George Reeves, the star of the television series Adventures of Superman. (126 mins.)
Director: Allen Coulter
 
7.
1408 (2007)
    1 2 3 4 5 6 7 8 9 10 6.8/10 X  
A man who specializes in debunking paranormal occurrences checks into the fabled room 1408 in the Dolphin Hotel. Soon after settling in, he confronts genuine terror. (104 mins.)
 
8.
American Beauty (1999)
    1 2 3 4 5 6 7 8 9 10 8.4/10 X  
A sexually frustrated suburban father has a mid-life crisis after becoming infatuated with his daughter's best friend. (122 mins.)
Director: Sam Mendes
 
9.
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
 
10.
Cube (1997)
    1 2 3 4 5 6 7 8 9 10 7.3/10 X  
Six complete strangers of widely varying personality characteristics are involuntarily placed in an endless kafkaesque maze containing deadly traps. (90 mins.)
Director: Vincenzo Natali
 
11.
Nothing (2003)
    1 2 3 4 5 6 7 8 9 10 6.3/10 X  
After a terrible day, two good friends and housemates find the outside world converted into a featureless and empty white void. (90 mins.)
Director: Vincenzo Natali
 
12.
Black Swan (2010)
    1 2 3 4 5 6 7 8 9 10 8.0/10 X  
A committed dancer wins the lead role in a production of Tchaikovsky's "Swan Lake" only to find herself struggling to maintain her sanity. (108 mins.)
 
13.
Bronson (2008)
    1 2 3 4 5 6 7 8 9 10 7.1/10 X  
A young man who was sentenced to seven years in prison for robbing a post office ends up spending three decades in solitary confinement. During this time, his own personality is supplanted by his alter-ego, Charles Bronson. (92 mins.)
 
14.
Frequently Asked Questions About Time Travel (2009)
    1 2 3 4 5 6 7 8 9 10 7.1/10 X  
While drinking at their local pub, three social outcasts attempt to navigate a time-travel conundrum. (83 mins.)
 
15.
Garden State (2004)
    1 2 3 4 5 6 7 8 9 10 7.6/10 X  
A quietly troubled young man returns home for his mother's funeral after being estranged from his family for a decade. (102 mins.)
Director: Zach Braff
 
16.
Gattaca (1997)
    1 2 3 4 5 6 7 8 9 10 7.8/10 X  
A genetically inferior man assumes the identity of a superior one in order to pursue his lifelong dream of space travel. (106 mins.)
Director: Andrew Niccol
 
17.
Timecrimes (2007)
    1 2 3 4 5 6 7 8 9 10 7.2/10 X  
A man accidentally gets into a time machine and travels back in time nearly an hour. Finding himself will be the first of a series of disasters of unforeseeable consequences. (92 mins.)
Director: Nacho Vigalondo
 
18.
Mulholland Dr. (2001)
    1 2 3 4 5 6 7 8 9 10 8.0/10 X  
After a car wreck on the winding Mulholland Drive renders a woman amnesiac, she and a perky Hollywood-hopeful search for clues and answers across Los Angeles in a twisting venture beyond dreams and reality. (147 mins.)
Director: David Lynch
 
19.
Unknown (2006)
    1 2 3 4 5 6 7 8 9 10 6.5/10 X  
Five men wake up in a locked-down warehouse with no memory of who they are. They are forced to figure out who is good and who is bad to stay alive. (85 mins.)
Director: Simon Brand