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Both Michael and Oscar's kiss on "The Office" and Jo and Arizona's on "Grey's Anatomy" were improved by the actors.
A few classic movie scenes, like the final fight in "Raiders of the Lost Ark" and the opening of "The Godfather," strayed from the original plans.
Some actors, including Catherine O'Hara on "Schitt's Creek" and Max Greenfield on "New Girl," have taken liberties with the pronunciation of certain words.
Despite their best efforts, most actors' unscripted moments don't make the final cut on the big or small screens. But when they do, many stars reveal the true depth of their talents.
Here are some of the most memorable on-screen moments that weren't in the original script:
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Chris Pratt came up with one of the most memorable "Parks and Recreation" lines on the fly.
Chris Pratt on "Parks and Recreation."
NBC
Steve Carell's surprise kiss on "The Office" wasn't in the script.
This iconic moment between Michael and Oscar almost didn't happen.
NBC
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The jewelry box gag in "Pretty Woman" wasn't planned.
Julia Roberts' laugh was real in the scene.
Touchstone Pictures
Tom Felton's amazing dig in "Harry Potter" almost didn't happen.
Tom Felton improvised the line in "Harry Potter and the Chamber of Secrets."
Warner Bros.
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KJ Apa's painful ice-punch on "Riverdale" was improvised.
KJ Apa really got injured during the "Riverdale" scene.
The CW
Leonardo DiCaprio also had an accidental injury while filming "Django Unchained."
Leonardo DiCaprio in "Django Unchained."
Miramax
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Jason Segel didn't know his character's father was going to die on "How I Met Your Mother."
Jason Segel's reaction was genuine.
CBS
The famous tagline from "Jaws" wasn't actually in the original script.
Roy Scheider added the line to "Jaws."
Universal / YouTube Screencap
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Viggo Mortensen broke two of his toes during his big helmet kick in "The Lord of the Rings: The Fellowship of the Ring."
Viggo Mortensen in "The Lord of the Rings: The Fellowship of the Ring."
LOTR Return of the King trailer / YouTube
Craig T. Nelson came up with his emotional speech on "Parenthood."
Craig T. Nelson improvised the whole monologue.
NBC
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The big fight scene at the end of "Raiders of the Lost Ark" had to be cut short because Harrison Ford had dysentery.
Harrison Ford in "Raiders of the Lost Ark."
Lucasfilm
Gene Wilder made up his grand entrance as Willy Wonka.
Gene Wilder in "Willy Wonka and the Chocolate Factory."
David L. Wolper Productions
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The cat was never in the script of "The Godfather."
Marlon Brando in "The Godfather."
Paramount Pictures
Millie Bobby Brown was genuinely exhausted at the end of the "Stranger Things" episode "The Sauna Test."
Millie Bobby Brown plays Eleven on "Stranger Things."
Netflix
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The iconic "Bridesmaids" food-poisoning scene wasn't in the original script.
Maya Rudolph in "Bridesmaids."
Universal Pictures
Catherine O'Hara came up with Moira's dramatic pronunciation of "bébé" on "Schitt's Creek."
Catherine O'Hara on "Schitt's Creek."
Pop TV
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The "Dirty Dancing" scene in "Crazy, Stupid, Love" came out of a conversation with Ryan Gosling.
Emma Stone and Ryan Gosling in "Crazy, Stupid, Love."
Warner Bros.
The jump-scare on episode eight of "The Haunting of Hill House" earned a genuine reaction from the actors.
Elizabeth Reaser on "The Haunting of Hill House."
Netflix
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Alicia Silverstone wasn't supposed to mispronounce Haitians in "Clueless."
Alicia Silverstone in "Clueless."
YouTube / Paramount
Jo and Arizona's kiss on "Grey's Anatomy" was a spur-of-the-moment decision.
Camilla Luddington plays Dr. Jo Wilson on "Grey's Anatomy."
ABC
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Most of Schmidt's rogue pronunciations on "New Girl" were unplanned.