Conspiracy Theory is a 1997 American political thriller film directed by Richard Donner.
Alice Sutton Julia Roberts is a lawyer working for the U.S. government at the Justice Department. Jerry Fletcher Mel Gibson, a conspiracytheory obsessed New York City taxi driver, continually expounds his ideas to her. Alice humors him because he once saved her from a mugging, but does not know he has been spying on her at home. Her own obsession is to solve the mystery of her fathers murder.Seeing suspicious activity everywhere, Jerry identifies some men as CIA workers, follows them into a building, and is captured. He wakes up bound to a wheelchair. A doctor Patrick Stewart injects him with LSD, and interrogates him using torture. Jerry experiences terrifying hallucinations and flashbacks, panics, and manages to escape, incapacitating the doctor by biting his nose. ........
Source: Wikipedia