In all honesty, I don't really have just one particular favorite film, as I have many favorites.

Now brace yourselves, 'cause it's gonna be a pretty long list.

Categorized by decade...

•1900's.
-A Trip to the Moon.

•1910's
-Land of the War Canoes.

•1920's.
-Safety Last.
-Metropolis.

•1930's.
-King Kong.
-Reefer Madness.
-The Wizard of Oz.

•1940's.
-Casablanca.

•1950's.
-Cinderella.
-The Seven Year Itch.

•1960's.
-Ocean's 11.
-101 Dalmatians.
-West Side Story.
-Goldfinger.
-A Hard Day's Night.
-Help!.
-Batman: The Movie.
-2001: A Space Odyssey.
-Psych-Out.
-Midnight Cowboy.
-The Magic Christian.
-On Her Majesty's Secret Service.

•1970's.
-The Aristocats.
-Tora! Tora! Tora!.
-Shaft.
-Tommy.
-Bobbie Jo and the Outlaw.
-Midway.
-Slap Shot.
-Star Wars.
-Saturday Night Fever.
-Halloween.
-Up In Smoke.
-Rock and Roll High School.
-The Warriors.

•1980's.
-Altered States.
-Fame.
-The Blues Brothers.
-Star Wars: The Empire Strikes Back.
-Clash of the Titans.
-Raiders of the Lost Ark.
-Blade Runner.
-The Dark Crystal.
-Pink Floyd: The Wall.
-E.T. The Extra-Terrestrial.
-Flashdance.
-Star Wars: Return of the Jedi.
-Footloose.
-Romancing The Stone.
-Amadeus.
-Purple Rain.
-Ghostbusters.
-Indiana Jones and the Temple of Doom.
-The Breakfast Club.
-Back To The Future.
-Rambo - First Blood: Part 2.
-Labyrinth.
-The Great Mouse Detective.
-Castle In The Sky.
-Stand By Me.
-Howard The Duck.
-Spaceballs.
-Robocop.
-A Fish Called Wanda.
-My Neighbor Totoro.
-Who Framed Roger Rabbit.
-Back To The Future: Part 2.
-UHF.
-Kiki's Delivery Service.
-Indiana Jones and the Last Crusade.
-Ghostbusters 2
-Batman.

•1990's.
-Back To The Future: Part 3.
-Robocop 2.
-Robin Hood: Prince of Thieves.
-The Addams Family.
-Wayne's World.
-Batman Returns.
-The Three Musketeers.
-Jurassic Park.
-Speed.
-Hackers.
-Goldeneye.
-Spice World.
-Titanic.
-The Mask of Zorro.

Usually I answer Casablanca to this question!

Probably Pink Flamingos because I'm a weirdo who loves John Waters movies

Bride of Frankenstein....close behind is The Wolf Man.

the Seven Samurai

I have a few:

Chariots of Fire
Diva
Running Scared (1986)
Peter’s Friends
Impromptu

My fave of all time?
The Rocky Horror Picture Show.

Close second - The Last Unicorn


No matter how many films I see, these will be my two favorite unless asked for a fave of some specific genres.

Casablanca.

Howl's Moving Castle

Big Fish

The Boondock Saints

How To Marry A Millionaire With Lauren Bacall

Four Brothers

The Ten Commandments

Myra Breckenridge

Mr. Mom

Identity Theft (2004 one not the with Jason Bateman, but that one is more for comedy, this one based on true story)

Fun with Dick and Jane 1977

Jaws 🦈

Many but - Big Lebowsky comes to mind right now

The Terminator

Obsession

wild target

Cabin Boy

My all-time favorite is probably Nosferatu: A Symphony of Horror, a 1922 silent German Expressionist vampire film.
A good contemporary movie, in my opinion, is Annihilation, a 2018 science-fiction cosmic horror film; best Lovecraftian style film I've ever seen.
I don't like realism in film too much: I see enough realism in the real world. I need other-wordly escapism.

The Silence of the Lambs

Hollow Man