Plot: Los Angeles-based French shop-keeper Thierry Guetta gets the idea that he would like to film street artists in the process of creating their work. He tells them that he is making a documentary, when in reality he has no intention of editing the footage into one cohesive movie. Unaware of this latter fact, many street artists from around the world agree to participate. Thierry even gets into the act by assisting them in creating the art. One of the artists that participates is the camera-shy Briton Banksy, who refuses to be shown on screen unless he is blacked out. Banksy does convince Thierry to use the footage to make a movie. In Thierry doing so, Banksy comes to the realization that Thierry is a lousy film-maker, but he is an interesting character in an odd yet appealing way. So Banksy decides to use the footage and add additional material to make his own movie about Thierry's journey in this project. Since Thierry spent so much time involved in the process of street art, Banksy also convinces Thierry to become a street artist himself. Thierry reinvents himself as street artist M.B.W., an acronym for Mr. Brainwash. Banksy, in the end, may regret this suggestion.
Alternative Plot: The infamous, shadowy British graffiti street artist Banksy has literally left his mark on cities throughout the world. He comes in contact with Thierry Guetta, a Los Angeles-based Frenchman who videotapes various underground art escapades, and later is transformed into an art phenomenon dubbed "Mr. Brainwash." Rhys Ifans narrates an overlapping documentary where the line between what is real and what might be fake blurs, as modern art and celebrity are put under the microscope.
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