Dune (1984) dir. David Lynch
THX 1138 (1971) dir. George Lucas
I really enjoyed watching this pair because each film touches a very distinct corner of science-fiction. Lynch develops the mythos of Dune with techo-surrealist imagery that often bleeds into the grotesque. The dystopian sterility of THX 1138 counterpoints this ethereal vision by planting the viewer on much firmer (read: foreboding) ground. Plus, you get to see what George Lucas was doing before Star Wars ate the world.