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The Best Robert Downey Jr. Ad Libs In MCU Movies

List RulesVote up your favorite improvised Iron Man lines!

Robert Downey Jr. is basically the embodiment of the Marvel Cinematic Universe. There may be no line which more perfectly set the tone for what the Marvel Cinematic Universe would grow to become than Tony Stark announcing to the world in 2008, "I am Iron Man." That original line, amongst many others, was improvised by Downey on the spot.

Downey was practically given free rein to explore Stark's dialogue in each film, and many of the improvised lines ended up being some of the most memorable. Take a look below and vote up the best improvised Iron Man quotes!

  • Photo: Iron Man / Paramount Pictures
    2345 VOTES

    The Last Line In 'Iron Man' Set The Course For The MCU

    In the script for Iron Man, SHIELD develops the coverup that the guy in the suit is Tony Stark's bodyguard. This is true in the original Iron Man comics, but Downey, being the real-life Stark, decided to switch things up. The MCU was forever defined by Stark declaring, "I am Iron Man." Marvel President Kevin Feige told IndieWire

    If you're changing something for no reason, that’s one thing, but if you're changing something because you want to double-down on the spirit of who the character is? That's a change we'll make. Tony Stark not reading off the card and not sticking with the fixed story? Him just blurting out 'I am Iron Man'? That seems very much in keeping with who that character is.

    Great line?
  • Photo: Spider-Man: Homecoming / Sony Pictures Releasing
    2024 VOTES

    He Added The 'Hug' Line In 'Spider-Man: Homecoming'

    In an interview for The Lost City of Z, Tom Holland spoke about the scene between Peter and Tony in the beginning of Spider-Man: Homecoming. Apparently, most of this scene was improvised. When asked, Tom said: 

    I think I just tried to hug him. I just thought it would be funny if I hugged him, and Robert's instincts are so good, he was like, 'Oh, I'm not trying to hug you I'm just going to get the door.

    Great line?
  • Photo: Avengers: Endgame / Walt Disney Studios Motion Pictures
    1789 VOTES

    One Of The Most Memorable Lines From 'Endgame' Was Inspired By His Kids

    "I love you 3000," was one of the best lines of dialogue to come out of Avengers: Endgame. The layers of emotional depth behind it, following the events and fallout of Endgame, really left a mark on audiences. To make things even more emotional, the screenwriters drew the inspiration directly from Downey's relationship with his own kids. When asked about the line, screenwriter Stephen McFeely told Insider:

    The line went, 'I love you tons. I love you tons. And so, he says, 'I love you tons,' but his children say to him, 'I love you, 3,000.'

    Great line?
  • 4
    2292 VOTES

    Joss Whedon Thought The Galaga Quip Was Hilarious In 'Avengers' 

    One of the most memorable gags in The Avengers is when Stark calls out a SHIELD employee, saying, "That man is playing Galaga! He thought we wouldn't notice, but we did."

    In the DVD commentary, director Joss Whedon explains that Robert Downey Jr. improvised that line, and he thought it was so funny they added a Galaga screen on the man's computer in post-production. 

    Great line?