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What's The Best Improvised Marvel Movie Line Or Scene?

"Mr. Stark... I don't feel so good."

If you're anything like me, you've probably spent a lot of time watching movies and researching trivia and behind-the-scenes facts about them.

And if you've done that, you've definitely come across some fascinating ~improvised~ movie moments.

So, because there are so many brilliant Marvel movies in the world, we want to know your favorite improvised and unscripted moments from them.

Maybe you know that Tom Holland improvised his final lines before disintegrating in Avengers: Infinity War, and it makes you cry every single time.

Perhaps you absolutely loved when Robert Downey Jr. deviated from the script and ad-libbed the famous "I am Iron Man" line at the end of Iron Man.

Or maybe you loved that whole "hug" scene in Spider-Man: Homecoming between Tom Holland and Robert Downey Jr., which was 100% improvised.

There are so many iconic moments to choose from, so use the DropBox below to tell us your favorite improvised and ad-libbed Marvel movie moments!

The best responses will be featured in an upcoming BuzzFeed Community post or video!