I going to update this every week and see how many of the categories I can knock out before I get bored and/or totally forget.
Anyone else can feel free to do this as well.
Spoiler: List of genres
Action and Adventure
Action or Adventure Comedy
Action/Adventure Drama
Animal
Biker
Blaxploitation
Blockbusters
Buddy
Caper
Chase Films or Thrillers
Comic-Book Action
Confined Space Action
Conspiracy Thriller (aka Paranoid Thriller)
Cop Action
Costume Adventures
Crime Films
Desert Epics
Disaster or Doomsday
Epic Adventure Films
Erotic Thrillers
Escape
Family-oriented Adventure
Fantasy Adventure
Girls With Guns
Guy Films
Heist - Caper Films
Heroic Bloodshed Films
Historical Spectacles
Hong Kong
James Bond Series
Jungle and Safari Epics
Literature/Folklore Adventure Heroes
Martial Arts Action
Man or Woman-In-Peril
Man vs. Nature
Mountain
Period Action Films
Political Conspiracies, Thrillers
Poliziotteschi (Italian)
Psychological Thriller
Quest
Rape and Revenge Films
Road
Romantic Adventures
Sci-Fi Action/Adventure
Samurai
Sea Adventures
Searches/Expeditions for Lost Continents
Serialized films
Space Adventures
Spy
Straight Action/ Conflict
Super-Heroes
Surfing or Surf Films
Survival
Swashbuckler
Sword and Sorcery (or "Sword and Sandal")
(Action) Suspense-Thrillers
Techno-Thrillers
Treasure Hunts
Undercover
Women in Prison
Comedy
Absurd
Action Comedies
Anarchic Comedies
Black Comedies (Dark Humor)
British Humor
Classic Comedies
Clown
Comedy Thrillers
Comic Criminals
Coming of Age
Conceptual
Crime/Caper Comedies
'Dumb' Comedies
Fairy Tale
Family Comedies
Farce
Fish-out-of-water Comedies
Gross-out Comedies
Horror Comedies
Lampoon
Mafia Comedies
"Meet-Cute" Screwball or Romantic Comedies
Military Comedies
Mock-umentary (Fake Documentary)
Musical Comedies
Parenthood Comedies
Parody
Political Comedies
Populist
Pre-Teen Comedies
Re-Marriage Comedies
Romantic Comedies
Satire
School Days
Screwball Comedies
Sex Comedies
Slacker
Slapstick
Social-Class Comedies
Sophisticated Comedies
Spoofs
Sports Comedies
Stand-Up
Stoner Comedies
Supernatural Comedies
Teen/Teen Sex Comedies
Urban Comedies
War Comedies
Western Comedies
Zombie Comedies
Crime & Gangster
'Bad Girl' Movies
Buddy Cop
Caper Stories
Cops & Robbers
Courtroom Drama
Crime Comedy or Drama
Detective/Mysteries
Espionage
Femme Fatales
Film Noir
Hard-boiled Detective
Heist
Juvenile Delinquency
Law and Order
Lovers on the Run Road Films
Mafia (Gangster), Organized Crime, Mob Films
Mysteries
Neo-Noir
Outlaw Biker Films
Police/Detective
Post-Noir
Procedurals
Prison
Private-Eye
Suspense-Thrillers
Trial Films
True Crime
Vice Films
Victim
Who-dun-its
Drama
Adaptations, Based upon True Stories
Addiction and/or Alcoholism
Adventure Drama
Adult
African-American
Americana
Autobiographies/Biographies
Biopics (Biographical)
British Empire
"Chick" Flicks or "Guy-Cry" Films
Childhood Dramas
Christmas Films
Coming-of-Age
Costume Dramas
Courtroom or Crime Dramas
Dance
Diary Films
Disease/Disability
Docu-dramas
Ensemble
Erotic Drama
Ethnic Family Saga
Euro-Spy Films
"Fallen" Women
Fantasy Drama
Feminist
Film a Clef
Gay and Lesbian
Generation Gap
Hagiographies (Religious Figures)
Heavenly Drama
High School
Holiday Film
Holocaust
Hood Films
Inspirational
Investigative Reporting
Legal/Courtroom
Life Story Literary Adaptation
Love
Marital Drama
Medical
Melodramas ("Women's Pictures," Tearjerkers, or "Weepies")
Message Movie
Musical Drama
Newspaper
Nostalgia
Odd Couple
Period Film
Police Drama
POW Drama
Presidential Politics or Political Dramas
Propaganda
Prostitution
Psychological Drama
Race Relations, Inter-racial Themes
Reunion
Road Movie
Romantic Dramas
Rural Drama
Sexual/Erotic (Steamy Romantic Dramas)
Shakespearean
Showbiz Dramas
Slice of Life
Soap Opera
Social Problem Film, Social Commentaries
Small-town Life
Sports Dramas or Biopics
Supernatural drama
Teen (or Youth) Films
Tragedy
True Crime Drama
Urban Drama
War-Military Dramas
Women's Friendship
Youth Culture
Epics/Historical
Biblical
Dark Ages
Greek Myth
Hagiographies
Historical or Biographical Epics (Biopics)
Indian History
Literary Adaptation
Medieval (Dark Ages)
'Period Pictures'
Religious
Roman Empire
Romantic Epic
Sword and Sandal
War or Westerns (Epic)
Horror
B-Movie Horror
Cannibalism or Cannibal Films
Classic Horror
Costume Horror
Creature Features
Demonic Possession
Dracula
Erotic
Frankenstein, other Mad Scientists
Ghosts
Giallo (European, Italian specifically)
Gore
Gothic
Haunted House, other Hauntings
Halloween
Horror Comedy
Macabre
Monsters
Natural Horror
Older-Woman-In-Peril Films ("Psycho-Biddy", aka 'Hag Horror' or 'Hagsploitation')
Psychic Powers
Psychological Horror
Reincarnation
Sadistic Horror
Satanic Stories
Sci-Fi Horror
Serial Killers
Sex Horror
Slashers or "Splatter" Films
Supernatural Horror
Teen Terror ("Teen Screams")
Terror
Vampires
Witchcraft
Wolves, Werewolves
Zombies
Musicals/Dance
Animated
Backstage Musicals
Ballet
Beach Party Films
Musical Biographies
Broadway Show Musicals
Comedy Musicals
Concert Films
Dance Films
Dramatic Musicals
Fairy-tale Musicals Fantasy Musical
Film-Opera
Folk Musicals
Hip-Hop Films
Operettas
Rock-umentary
Romantic Musicals
Show-Biz Comedy
Stage Musicals
Western Musicals
Science Fiction
Action or Adventure Sci-Fi
Alien Invasion
Aliens, Extra-Terrestrial Encounters
Anime
Atomic Age
Classic Sci-Fi
Creature Films
Cyber Punk
Disaster
Dystopia
End of World
Fairy Tales
Fantasy Films
50's Sci-Fi
Futuristic
Lost Worlds
Mad Scientists
Monsters and Mutants
Natural Horror
Other Dimensions
Outer Space
Post-Apocalyptic
Pre-historic
Psychological Sci-Fi
Robots, Cyborgs and Androids
Sci-Fi Comedies
Sci-Fi Thrillers
Space Opera
Space or Sci-Fi Westerns
Star Trek
Super-Hero Films (e.g., Supermen and Others)
Supernatural
Tech-Noir
Time or Space Travel
Virtual Reality
War
Action Combat
Aerial Combat, Aviation
Afghanistan-Iraq Conflict
Anti-War
Civil War
Combat
Gulf War
Korean War
Military
Military Comedy
Prisoner of War (POW)/Escape
Resistance
Revolutionary War
War-Spy
Submarine
Vietnam War
War Adventure
War Epic
War Romance
World War I
World War II
Westerns
B-Western
Biographies
Cattle Drive
Cavalry
Comedy Westerns
Epic Westerns
Euro-Westerns
Frontier
Gunfighters
Historical
Hybrid Westerns (with horror, noir, road movie, martial arts, etc.)
Indian War or Indian Westerns
Issue Western
Modern Western
Musical Western
Outlaws
Psychological Westerns
Revisionist
Road-Trail Journeys
Romantic Westerns
Science-Fiction Westerns
Shoot-outs
Space Westerns
'Spaghetti' Westerns
Spoof Westerns
Traditional