Help me out, guys?

All police acadamy movies

Independence day

Gremlins movies

Black hawk down

the godfather saga

Titanic( just do it)

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the exorcist(1973 version)

V for vendetta because i also hate the government :D

Commando

Django Unchained(not that old but good)

Gangs of New York(awsome film, and i mean awsome)

The perfect storm

Blade Runner (1982) (epic film)

Twelve Monkeys (1995)

and finally clockwork orange( alot more out thier but my head hurts now xD

Keith Lemon: The Film. Best movie ever.

Shawnshank Redemption is great. Also I'd recommend (apart from the ones on your list) that you watch the following animated batman films

• Year One
• The Red Hood
• The Dark Knight Returns.

Films I've also enjoyed are Oldboy or Being John Malkovich. Also watch Tangled.

American History X, Gangs of New York, Public Enemies, Donnie Darko, Mr.Nobody, Fight Club, Gamer, Inglorious Basterds, Gran Torino, 21 Gram's, The Pursuit of Happyness, Shutter Island, The Other Guys, 21 Jump Street, Lords Of Dogtown, The Fighter , Equilibrium, American Psycho , 25th Hour, The Prestige

damn....I seriously cannot list all the stuffs I have watched and have loved...just go to IMDB and pick the movie you like and watch all the other recommendations. The movies I just watched recently were garden state (2004) and death at a funeral (2007, do NOT watch the 2010 version)

Everything from Tim Burton

Definitely the old Robocop movie.

Go fishing.

Blade Runner

Chłopaki nie płaczą - Boys don't cry \m/

When i back i update this list

Here are a few that I suggest you give a try:
Clue the Movie,
Good Fellas,
The Thing (Old version),
The Evil Dead movies (The old ones),
Blair Witch Project

Superbabies: Baby Geniuses 2 (and the first one, ofc), Freddy Got Fingered, The Hottie & the Nottie, Son of the Mask, A Haunted House.

My heart still skips a beat when I'm thinking about these movies, they are just THAT good.

Monty Python's Holy Grail & Life of Brian

V for vendetta,12 monkeys and clockwork orange I concur too.
I might add Requiem for a dream, Pan's labyrinth,Event horizon, The Mist ,Sucker punch( I quite liked it even tough some people didn't quite understand it),Drive( mostly because Ryan Gosling, heh x.x), Intouchables
Then there might be some more girly movies like The perks of being a wallflower , The Notebook, Let Me In(a nice romance movie with a dark theme)
And probably some others i don't quite remember.

Old Men in New Cars & In China They Eat Dogs (ties in with the crime/thriller/heist movies)
Pacific Rim (for sci-fi / monster fix)
Tokyo Gore Police/The Machine Girl/Big Tit Zombie/Zombie Ass (because no such list is complete without at least one Japanese trash movie bumping up the Dafuq levels)

All of the following movies and their sequels :D Friday The 13th, Nightmare on Elm Street, Wishmaster, Candyman, Critters, Leprechaun, People Under The Stairs << a must, Evil Dead, Hellraiser, Omen, Exorcist and any other 80s horror movies :D

Memento, From dusk 'till dawn, The usual suspects,... They're just a little bit different. ;)

First on my mind:

The Godfather Saga
Scarface
Carito's Way
Donnie Brasco
The Goodfellas
The Untouchables
Reservoir Dogs
Se7en
The Fight Club
The Departed
The Silence of the Lambs
Pulp Fiction
Natural Born Killers

Malibu`s most wanted.

Scent of a woman. Truly an amazing performance by Al Pacino.

Air Force One

All the Die Hard movies 

 Under Siege

Clear your schedule, bro.

The 13th Warrior
As Good as it Gets
The Abyss
The Adventures of Baron Munchausen
Baseketball
Big Trouble in Little China
Braveheart
Brotherhood of the Wolf
The Breakfast Club
Can't Hardly Wait
The Count of Monte Cristo
Dances with Wolves
Dark City
Dragonslayer
Dune
The Dark Crystal
Erik the Viking
Event Horizon
Excalibur
Explorers
The Exorcist III
Falling Down
Fresh
Gangs of New York
Gladiator (1992)
The Goonies
I am Sam
Idiocracy
In the Mouth of Madness
Jacob's Ladder
The Jacket
Kickboxer (fuck you, this movie is awesome)
Krull
Kung Fu Hustle
Labyrinth
Leviathan
Love Stinks
The Lost Boys
Monty Python and the Holy Grail
PCU
Predator
Prince of Darkness
The Princess Bride
Rocky 1-4
Rounders
Scrooged
Stand by Me
The Shawshank Redemption
The Thing (1982)
The Three Amigos
Time Bandits
Tombstone
Tomcats
True Romance
Twelve Monkeys
What Dreams May Come
Young Guns

There are a lot of others I should include, or may have overlooked. But I don't want this list being 20 pages long.

Go through everyone else's list. A lot of great suggestions. Like Fight Club. But the only two I can think of that hasn't been listed are Way Of The Gun and Dirty Work

Reservoir Dogs, Django, Kill Bill, L.A. Confidential, Donnie Darko, The Godfather, Snatch., The Matrix, The Usual Suspects, Se7en, Léon: The Professional, Fight Club

The Big Lebowski is a definite must see.