A Future Shock film from 1971 directed by George Lucas, with Robert Duvall cast as the lead. It's a compelling look at a futuristic pharmaceutical controlled society that lived below ground. The story is interesting. although displayed in a cheesy fashion, perhaps Abstract would be a more appropriate term for it. Still all and all a Great Film and applicable to what those in control would like our future to be.
Also on an interesting if not odd note. In the intro to the mid 90's cartoon series "Pinky and The Brain" Brain writes THX 1138 on his chalk board then quickly erases it. I loved the Animaniacs.
[mod: link removed - unless a film is public domain, don't link to streaming sites]