I forgot about Office Space, Rocky Horror Picture Show and Donnie Darko
I would also like to add Labyrinth, The Dark Crystal, The Returner (best Japanese Hollywood sci-fi rip off ever!), Dreams (Akira Kurosawa flick), Night on the Galactic Railroad, and Robot Carnival.
Honorable mentions though I'm not sure if they count...
Grosse Point Blank, Gun Shy, and Wasabi.
My list of must watch:
Evil Dead 1 & 2
Metropolis
Escape from New York (and L.A.)