Being John Malkovich (1999)

Craig, a puppeteer, discovers a hidden doorway in his office, which turns out to be a portal into John Malkovitch';;s mind. Upon entering the portal, one gets to be inside Malkovitch';;s mind for 15 odd minutes to see, hear, and feel whatever JM is doing. As with any great discovery of this century, the ultimate question immediately arises : ';;How can we make money out of this?';; He and his co-worker promptly set out to exploit this discovery. It doesn';;t take long for things to go haywire