Iron Man's Most Famous Line Was Completely Unscripted

Marvel Entertainment/MovieStillsDB

One of the earliest unscripted lines in the MCU came in the very first Iron Man film. The now-iconic line "I am Iron Man" by Tony Stark was completely ad-libbed by RDJ. The line is now one of the most famous, and it did a lot to inspire the unscripted direction of Marvel movies.

Producer Kevin Feige said that RDJ's early ad-lib "inspired us to go further in trusting ourselves... and not being afraid to adapt and evolve" from the comic books.

RDJ's protog00e9 Tom Holland took a page out of his book and also improvised his most famous MCU line.