Directed by Spike Jonze and written by Charlie Kaufman, Being John Malkovich follows a puppeteer who discovers a portal into the mind of actor John Malkovich. Starring John Cusack, Cameron Diaz, and Catherine Keener, the film explores identity, control, and perception through an unconventional narrative. John Malkovich appears as a fictionalized version of himself.

Från IMDB:
A puppeteer discovers a portal that leads literally into the head of movie star John Malkovich.