CLIPS on Instagram: " Fun Fact: The iconic final line in the movie Iron Man (2008), where Tony Stark declares “I am Iron Man,” was completely improvised by Robert Downey Jr. The script originally called for him to stick to a cover story, but the ad-lib was so in character that the filmmakers decided to keep it, a choice that broke the superhero secret identity trope and set the Marvel Cinematic Universe on its unique path."