[andrew.v.spencer]

In no particular order:

1. Blade Runner. Those cityscapes, that music, the uncertainty.
2. Alien. Brilliant, desolate and terrifying.
3. Aliens. "Affirmative."
4. Forbidden planet. Terrifying monster, great sounds, ideas and special effects.
5. Matrix.
6. Terminator.
7. The incredible shrinking man.
8. The Thing.
9. Dark Star
10. Star Wars

Honourable mentions:

Them. Classic B movie giant ants.
Close Encounters.
Donnie Darko.
T2.
Solaris
Starship Troopers
Silent Running
Planet of the Apes