EXCLUSIVE: French artist Thierry Guetta aka Mr. Brainwash, who gained prominence after appearing in Banksy’s 2010 film Exit Through the Gift Shop, is getting his own documentary. The feature-length pic hails from OBB Pictures and will be directed by Michael D. Ratner, who helmed and executive produced Justin Bieber: Seasons for YouTube Originals and its follow-up Justin Bieber: Next Chapter.