I am going to start a list of great conspiracy films. The goal is to build a living breathing list of films to see in this area. Then open up to discussion in the comments as to why it is conspiratorial, for people to source facts and debate. Let's talk about conspiracy folks. These films below are all films i have thoroughly enjoyed, and recommend seeing as well as doing some research.
-Eyes Wide Shut
-Minority Report
-Total Recall
-Manchurian Candidate
-Resurrect Dead: The Mystery of the Toynbee Tiles ( documentary)
-They Live
-Paycheck
-Next
-The Adjustment Bureau
-Blade Runner
-A Scanner Darkly
-V for Vendetta
-Shutter Island
-Mulholland Drive
-The Illusionist