That famous final line was an ad-lib, and it shaped everything that came next for the Marvel Cinematic Universe.
40 Tiny Details in Marvel Movies You May Have Missed – GO Social
KEVIN FEIGE DENIES RUMORS OF RDJ RETURNING AS IRON MAN - The Illuminerdi
Iron Man's Future in the Marvel Cinematic Universe - Inside the Magic
Ryan Leston - SlashFilm
Here's how 'Iron Man' built the modern Marvel Cinematic Universe in 5 phases
Iron Man' At 10: How One Film Set A Dominant Path For Marvel
RDJ Improvised One Line and Changed The MCU Forever - Inside the Magic
Benedict Cumberbatch on Improvising 'Douchebag' Line in 'Infinity War
Robert Downey Jr. Changed The MCU With An Improvised Iron Man Line
Marvel Movies: Best Moments and Lines Not in the Script