Conspiracy Theory (1997)
Directed by Richard Donner this film stars Mel Gibson, Julia Roberts and Patrick Stewart. A crazy taxi driver with an obsession for conspiracy theories manages to actually stumble into a real conspiracy.
For a film based on such a wide ranging topic the plot of this film is surprisingly thin and largely boils down to chase scenes. The story itself does not really make a huge amount of sense if you think about it for too long either. While Mel Gibson does his best in the lead role I think he was miss cast and does not fit the type you would expect to be a conspiracy theorist.