Thief (1981) - title
Stay Hungry (1978) - Arnold Schwarzenegger gets Jeff Bridges into bodybuilding
A Boy and His Dog (1975) - post apocalypse desert rambler
Manborg (2011) - trashy low budget action/scifi
Cube (1997) - one of the most copied movies ever, people are trapped in a puzzle box
2010: The Year We Make Contact (1984) - 2001 sequel, less abstract
Sorcerer (1977) - the only way to get this nitroglycerin across the jungle is in these shitty ass trucks
A Scanner Darkly (2006) - best Philip K Dick adaptation
edit: seconding Aguirre, Stalker, Le Samourai, Moon, and Event Horizon from other people's posts