Robert Downey Jr.'s portrayal of Tony Stark in the Iron Man movie series was directly inspired by and based on Elon Musk.
Robert Downey Jr was in a 1985 movie called "Tuff Turf". At 30:52 of the movie it predicts (by 27 years) his biggest role with a spray paint tag on the wall of: "THE NEW AVENGERS".
Robert Downey Jr. was allowed by his father to smoke marijuana at the age of six.
Robert Downey Jr. went blackface for most of Tropic Thunder, but the movie was mostly criticized by Disability advocates for the alleged offensive treatment of individuals with mental disabilities throughout the film.
Robert Downey Jr. gave Chris Evans a custom-designed "Steve Rogers" car with the Captain America shield emblazoned on the steering wheel.
Robert Downey Jr. broke Halle Berry's arm while filming Gothika in a scene where he had to twist her arm behind her back.
Robert Downey Jr. did the voice acting of Patrick Pewterschmidt in the TV show "Family Guy."
Robert Downey Jr. worked in a restaurant as a busboy for 3 years. He never made it to the waiter because he was too sweaty and didn't have the finesse.
Before his sobriety, Robert Downey Jr. once blacked out and was found asleep in the bedroom of his neighbor’s 11-year-old child.
Robert Downey Jr.'s first acting role in the film Pound was as a puppy which was directed by his father, Robert Downey Sr.