Trainspotting
Casino
Goodfellas
Saw
The Naked Gun (trilogy)
American Pie (trilogy)
Uncle Buck
Forrest Gump
Patriot Games
Clear and Present Danger
Hunt for the Red October
Farenheit 9/11
Bowling for Columbine
The Green Mile
The Italian Job (original)
Most Bonds - Goldfinger, Thunderball, Live and Let Die, Octopussy, A View To A Kill, For Your Eyes Only, The Spy Who Loved Me, Goldeneye, Tomorrow Never Dies (my favourites)
Borat
Bruno
Dumb and Dumber
South Park (the movie)
The League Of Gentlemen (1960's not modern crap) - this is a fantastic film, possibly my favourite, stiff upper lip crime caper, check it out if you get the chance.

Some personal favourites, in no particular order...

In the heat of the night
Angel heart
Naked
Days of heaven
Apocalypto
The big blue
Aguirre, wrath of god
Fitzcarraldo
Paris, Texas
The wild bunch
A clockwork orange
Frozen land
Wendy and Lucy
In Bruges
Ride with the devil
Mesrine 1 + 2
Southern comfort
Play misty for me
Deliverance
American history X
Psycho
Frenzy
The birds
The Consequences of love
Glengarry Glenross
Rounders
Kiss or kill
The Texas chainsaw massacre
Evil Dead
13 Tzameti
London to Brighton
Pusher
Downfall
Amelie
Betty blue
Dead ringers
Hana Bi
Night on earth
Fear and loathing in Las vegas
Dead birds
Cinema paradiso
La haine
4 months, 3 weeks, 2 days
Paranormal activity
Suspiria
Tenebrae
Henry, portrait of a serial killer
Repulsion
Scanners
The wicker man
The Blair witch project
Night of the living dead
Dawn of the dead
Dead set
The Killer
A bittersweet life
I'm not scared
Irreversible
The shining
Tell no one
City of life and death

Most of these have been mentioned already, but for double impact:

Man on Fire
Leon
Anchorman
Batman Begins
Iron Man
Fight Club
6th Sense
Green Mile
Eternal sunshine of the spotless mind
Gladiator (who hasnt seen that)
Hotel Rwanda
Kung Fu Hustle
Shawshank Redemption
United 93
Crash (2005)
Butterfly Effect

Airplane.

"My orders came through. My squadron ships out tomorrow. We're bombing the storage depots at Daiquiri at 1800 hours. We're coming in from the north, below their radar."
"When will you be back? "
"I can't tell you that. It's classified. "

I'd list the following, some already mentioned.

Get Carter (the Caine 1970 original)

Smokey & The Bandit (best bit for me is Jackie Gleason's venom spitting Sheriff Buford T. Justice)

The Italian Job (the Caine original)

The Long Good Friday (Bob 'oskins at his bullish best)

Airplane (we've gotta get these people to a hospital) [what is it Doctor?] (its a big building full of sick people, but that doesnt matter right now)

Sexy Beast (not a dutch film before anybody mentions it - Ben Kingsley is a one man tour de force as Don Logan)

The French Connection

Bullitt

Scarface

In Bruges

Team America: World Police

Carry on Cleo (or Carry on Camping)

Lock Stock & 2 Smoking Barrels

Nuns on the Run

The Third Man

The Day of the Jackal (Edward Fox 1960's original)

Dirty Harry (or Magnum Force - the better of the Dirty Harry films)

In The Loop

Shaun of the Dead

The Poseidon Adventure (the original again)

Internet Movie Database Top 250

http://www.imdb.com/chart/top

Hundreds of thousands of movie fans can't be wrong!

Raiders Of The Lost Ark is a full 60 places above Full Metal Jacket so I'd argue that yes, they can.

Some great suggestions on here though, loads I've seen but should probably watch again. Loads that I haven't seen and will be going on the list.

Keep up the good work forum.

Before Sunrise

This is a must see film.

Unless you only like gun fights explosions and car chases.

Scent of a woman
Fargo
Taxi (french)
Delicatessen (french)

There are some very good Hitchcock films, but I have to agree that Citizen Kane is the greatest film of all time.

I also think the Truman Show if fantastic

Hard Candy - Not many know about this film. It's amazing; the movie is almost entirely shot in one house, with 2 actors! Brilliant stuff!

I'm suprised Full Metal Jacket is only 60 places below Raiders of the Lost Ark

Give me Platoon, Hamburger Hill or Hanoi Hilton before FMJ anytime.

Little shop of horrors
training day

Burn after reading was terrible!!!!

Just watched District 9, I'd definitely add that if you like alien / sci-fi blockbusters.

Well obviously not everyone will agree.

I wouldn't really compare FMJ to other war films though as I don't really see it as a film about war as such. I think it's much more about the mindset and there's very little action in it. Much like Jarhead in a way.

But Indiana Jones......do me a favour.

I have one word to discribe this film: weak

That's why I said blockbuster. Some people like them some dont.

Agreed, its not really a Vietnam 'War' film, more about boot camp. Just a film I've never taken to.

Indiana Jones

Don't get me wrong, I think the Indiana Jones films are good fun, but then I also enjoy Dumb and Dumber and I wouldn't put that in the top 250 films of all time.

The 'toilet scene' with Jeff Daniels had me in tears the first time I saw it - classic

I've just watched 'there will be blood' what a good film, I also loved 'no country for old men' so perhaps it's the filming style that I prefer?

That is the most uncomfortable film EVER for a man to watch!

Requiem for a dream - Also not one to watch with your parents especially the end scene!

Ooooh, yes! Good call... also his previous one Pi

Gran Torino
Banlieu (French)
Harry Brown
Being There
Falling down
The boat that rocked
The book of Eli
My all time favourite is Zulu

Some great films mentioned, so agree with:

Scarface
Godfather Collection
The Big Blue
Schindler's List
The Deer Hunter
Planes, Trains and Automobiles

But would add -

Once Upon a Time in America
National Lampoon's Christmas Vacation - stupid film, but always make's me laugh
The Omen
Gandhi

I forgot about National Lampoons Loaded Weapon, the perfect antidote to the Lethal Weapon films

Couldn't see it mentioned, but maybe not looking hard enough,

Lawrence of Arabia. Superb movie, truly superb!

Oh, and Apollo 13, even though we know what happens at the end....

And don't we know it!

Oh, yes Apollo 13.... never liked Tom Hanks, until this film.