here is my top ten as if anybody cares (it does change)

1. Empire Strikes Back
2. A New Hope
3. Return of the Jedi
4 Back to the Future
5. Forest Gump
6. Saving Private Ryan
7. Raiders of the Lost Ark
8. Lord of the Rings: Return of the King
9. The Virgin Suicides
10.Shawshank Redemption

some other good ones

Nosferatu
Casablanca
Strangers on a TrainRear Window
North by Northwest
vertigo
the birds
Pyscho
dazed and confused
NECESSARY ROUGHNESS (got to love larry miller)
animal house
full metal jacket
american psycho
E.T.
21 grams
Die Hard
terminator 2
The Princess Bride
Se7en
LA confidential
fight club
taxi driver
the matrix
memento
pulp fiction
the other two lord of the rings
schindler's list
rocky
planet of the apes
tombstone
it's a wonderful life
hoop dreams
a clockwork orange
shadow of a vampire (max schrek doing the robot is priceless)
Lethal Weapon
Band of Brothers (not a movie, but close enough)
The Longest Yard
Army of Darkness
The Fifth Element
Goldfinger
The Time Machine (original)
Pleasantville
Maverick
The goonies

comedys (they get their own section because funny doesn't always make good movies)

dumb and dumber
south park
Monty Python and the Holy Grail
Young Frankenstein
NECESSARY ROUGHNESS and 10 things i hate about you (got to love larry miller)
animal house
billy madison
tommy boy
Loaded Weapon
office space
american pie
bill and ted 1
caddyshack
ghostbusters
old school

Mystery science theater 3000 movie (this island earth)
other MST 3000 episodes that are good

boggy creek, jack frost, final justice, hobgoblins, prince of space, giant spider invasion, the incredibly strange creatures who stopped living and became mixed-up zombies, time chasers, red zone cuba, a few others