Who needs a script when you have RDJ? For this list, we’ll be looking at all those catchy one-liners and scene-stealing moments that were reportedly ad-libbed, improvised or simply omitted from the words of the book, but still uttered on-screen by the Academy Award-winning superstar. Our countdown includes "Avengers: Endgame", "Spider-Man: Homecoming", "Tropic Thunder", and more! Agree? Disagree? Prefer Kiss Kiss to Bang Bang? Sound off on the comments below.

Watch more great Robert Downey Jr. videos here:
The Fall and Rise of Robert Downey Jr.:    • The Fall and Rise of Robert Downey Jr.  
Top 10 Robert Downey, Jr. Performances:    • Top 10 Robert Downey, Jr. Performances  
Top 10 Awesome Robert Downey Jr. Moments:    • Top 10 Awesome Robert Downey Jr. Moments  

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