While there was a good amount of improv in this Avengers film, it was also tightly scripted. When Vision asks Scarlet Witch to destroy the Infinity Stone keeping him alive, the entire scene is ad-libbed – on purpose. Things got silly, quick, but the actors were still able to come up with a scene that touched us.
Elizabeth Olsen says that it was ridiculous, and even though it was a big emotional scene, they were laughing and doing lots of different takes. It was up to the editors to make something out of it.
The Jokes From “Guardians”
With plenty of improv through the movies, the “Guardians of the Galaxy” get people laughing even as they're sucked in by the character drama and the action. A couple of the lines have been found to be made upon the spot, including when Rocket the raccoon says the line “Bunch of [naughty word], standing in a circle.”
Also, it was Chris Pratt who came up with the line about how dirty his ship is: “If I had a black light, this place would look like a Jackson Pollock painting.” Nasty. These two lines weren't in the script, but both of them helped us gain an appreciation for the film.
Paul Rudd Came Up With a Quick Comeback
While Hope Van Dyne and Scott Lang are training to make Lang into a superhero, Hope delivers a strike right to Lang's face. It was to prove a point, but he immediately came back with “Were you aiming for the face – or were you going for the hand?”
The line made it into the final cut, something that Van Dyne's actress, Evangeline Lilly, was quite pleased with. Like many of the other MCU films, “Ant-Man” had plenty of improv moments here and there, and this one is the most famous.
Some Football in Space
At the beginning of “Avengers: Endgame,” as Tony Stark and the blue-skinned Nebula are waiting to be rescued, they play a friendly game of paper football, something cherished by bored high schoolers everywhere. The dialogue of the scene remained unchanged, but the actors spruced the scene up with this friendly competition.
Karen Gillan (who played Nebula, duh) claimed that she was the winner since they hadn't practiced and the detail was thrown in at the last second. She was the better of the two characters, and thus she claimed victory.
The Gun Dance in “Joker”
Arthur Fleck – the Joker – showed us true madness on film thanks to Joaquin Phoenix. He danced, laughed, and sang his way through atrocities that shocked us. But one of the most memorable moments didn't even have any harm in it – Fleck receives a gun from a coworker. He plays around with the gun, randomly firing it.
There also wasn't supposed to have been any dialogue, but Fleck added some to make the scene even better. They set up a couple of cameras and let him do his thing. The crew knew that he would eventually fire into the wall, but they had no idea when it would happen. Viewers weren't the only ones startled.