5) The Avengers (2012)
Robert Downey Jr. is known to be impulsive in most situations and he outdid himself on the sets of The Avengers. He stashed his snacks within the lab scene, pulled them out without a pause, and dished them out to fellow actors at the time when the dialogue was climactic.
The look on their faces, especially that of Mark Ruffalo and Chris Evans, was entirely real because they did not expect this impromptu conversation. Director Joss Whedon was so enamoured with Downey's improvisation that he retained it in the final cut.
That little moment became a part of this playful dynamic between characters as it showed the bonhomie between the actors and elevated the authenticity of the scene.
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Edited by Mudeet Arora