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'Taxi Driver' (1976) - Robert De Niro was only given the instruction to speak to himself in the mirror, but his improvisation became one of Hollywood's most iconic moments.

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'Casablanca' (1942) - The classic romance, directed by Michael Curtiz, is known for its immortal line: "Here's looking at you, kid." Little do most people know, Humphrey Bogart improvised it!

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'Good Will Hunting' (1997) - One of the most memorable moments from the film is when Robin Williams discusses his wife's unconscious flatulence, but the improvisation worked splendidly and the two stars' fit of laughter was genuine.

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'Blade Runner' (1982) - The final iconic and cult-favorite tears-in-rain monologue—"All those moments will be lost in time, like tears in rain"—was largely improvised by actor Rutger Hauer!

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'Django Unchained' (2012) - Leonardo DiCaprio accidentally cut his hand open while filming a scene but decided to keep acting anyway, even smearing his real blood all over Kerry Washington's face. When the scene was over, the cast and crew gave him a standing ovation.

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'Bridesmaids' (2011) - The infamous scene where Maya Rudolph runs across the street in a wedding dress and proceeds to poop on the street was somehow born from the actress's imagination!

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'Raiders of the Lost Ark' (1981) - The script included a lengthy sword fight between Indiana Jones and one of the bad guys, but Ford was suffering from dysentery and could only film in 10 minute increments, so he changed the scene at the last minute and just shot the goon, cutting out what would have taken two to three days to film.

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'The Lord of the Rings: The Two Towers' (2002) - When Aragorn kicks a helmet out of frustration, he lets out an unscripted roar that was actually the result of actor Viggo Mortensen breaking his toe.

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'Harry Potter and the Chamber of Secrets' (2002) - When Harry and Ron transform into Crabbe and Goyle, Goyle is wearing glasses and Malfoy, AKA Tom Felton, asks why. Goyle says he was reading, and Felton, in place of a forgotten line, delivered one of Malfoy's most iconic lines: "I didn’t know you could read."

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'A Clockwork Orange' (1971) - After recording the same scene numerous times, the director gave Malcolm McDowell the freedom to do what he liked, so he danced and sang, all improvised.

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'The Empire Strikes Back' (1980) - In the scene where Hans Solo is taken to away to be frozen in the graphite machine, the character was supposed to reply "Me too," in response to Carrie Fisher's "I love you," but Harrison Ford changed it to "I know," to be more fitting for his character.

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'Annie Hall' (1977) - Much of the spontaneous clowning in the lobster-cooking scene was truly spontaneous, as was the scene where Alvy sneezes away a fortune's worth of cocaine at a party with Annie.

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'The Godfather' (1972) - Few people know the origins of the scene-stealing cat in the film which wasn't in the script, and many say that Francis Ford Coppola put the creature on Marlon Brando's lap just before they started filming.

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'Crazy, Stupid, Love' (2011) - Ryan Gosling and Emma Stone's intoxicating love scene, the pillow talk following the 'Dirty Dancing' bit, was almost all improvised, and the director said they just poured a couple drinks and filmed them for a really long time.

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'Reservoir Dogs' (1992) - The famous scene in which Mr. Blonde cuts off Marvin's ear was not described in the script, so Michael Madsen was free to improvise, putting on a show and joking around with a dance.

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'You've Got Mail' (1998) - When Tom Hanks exits the bookstore while carrying balloons and a goldfish, the balloons accidentally get caught in the door and he says, "Good thing it wasn't the fish!" That was pure Hanks.

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'The Usual Suspects' (1995) - In the lineup scene at the police station, the actors were simply supposed to step up and repeat a line, one by one, straight-faced. Apparently Benicio Del Toro kept farting and no one could get through the scene without laughing.

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'Jaws' (1975) - The classic line "You're gonna need a bigger boat," often remembered incorrectly as "We're gonna..." was entirely improvised by Roy Scheider, and has now gone down in history as one of the most memorable lines from the movie.

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'Willy Wonka and the Chocolate Factory' (1971) - Gene Wilder added a surprise, limp-to-somersault entrance into the film, which he felt was necessary to the character, since no one would know if he was lying or telling the truth from that point onward.

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'Pretty Woman' (1990) - In an interview, director Garry Marshall revealed that Richard Gere's snap of the necklace box wasn't planned, which made Julia Roberts's surprise and laughter completely genuine.

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'Call Me By Your Name' (2017) - Timothée Chalamet improvised that final moment of the film where his character looks emotionally into the camera's lens. He said it was an homage to the film 'Boyhood' where the main character stole a two-second look directly at the camera.

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'Aliens' (1986) - When the situation got tough in the film, Bill Paxton really felt the pressure, going off script when he said, "Game over, man. Game over!"

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'Midnight Cowboy' (1969) - While filming the movie in the streets of New York, a taxi reportedly jumped a light and almost hit Dustin Hoffman and Jon Voight, which is where the spontaneous and memorable line, "Hey, I'm walking here!" came from.

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'Dumb and Dumber' (1994) - The moment when Jim Carrey asks Jeff Daniels if he wants to hear the most annoying sound in the world, and then lets out a weird scream, was a scene that was not written in the script.

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'Batman: The Dark Knight' (2008) - In the scene where the Joker leaves the hospital, the bomb is supposed to go off right when he presses the detonator. Apparently it didn't work, but Ledger made one of the film's most comic points by continuing to act and fidgeting with the detonator until the explosion went off.

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'Silence of the Lambs' (1991) - Hannibal Lecter is known for the famous line, "Once a census taker tried to test me. I ate his liver with some fava beans and a nice Chianti." But the final touch in that scene, the strange noise he made afterwards, was a spur-of-the-moment choice.

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'Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb' (1964) - There was a lot of improvisation in Stanley Kubrick's classic film, but one of the standout moments was when Peter Sellers rises from his wheelchair, saying "Mein Führer! I can walk!"

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'The 40-Year-Old Virgin' (2005) - The entire chest-waxing scene was completely authentic, as it was Steve Carell's first time being waxed, and every hilariously creative swear word was a genuine response to the pain.

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'The 40-Year-Old Virgin' (2005) - Paul Rudd and Seth Rogen also improvised every "You know how I know you're gay" line, which worked so well that they repeated it in the movie 'Knocked Up.'

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'The Shining' (1980) - The terrifying scene in which Jack Nicholson breaks down a door with an ax is known for the improvised line, "Heeere's Johnny!" which Nicholson admits to borrowing from 'The Tonight Show Starring Johnny Carson.'

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'Harry Potter and the Deathly Hallows – Part 2' (2011) - Ralph Fiennes changed Voldemort's final speech with every rehearsal, and so the reaction from the rest of the cast was different and authentic for every take.

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'Full Metal Jacket' (1987) - In the classic war film, the director took advantage of actor R. Lee Ermey's military background in order to flesh out the character of the potty-mouthed drill sergeant. The result was a lot of improvisation based on Ermey's real-life experiences.

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'Goodfellas' (1990) - Most people don't know that in this film Joe Pesci reenacted a real moment in his life from years before, when he made the error of telling a gangster he was funny.

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'Saving Private Ryan' (1998) - In the brief meeting between Tom Hanks and Matt Damon, Ryan (Damon) delivers a kind of monologue with stories of his brothers and a girl back in the US, all of which Damon made up off the top of his head.

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'Clueless' (1995) - Donald Faison heard the phrase "Keeping it real" from a neighbor and decided to throw it into the film to make his character seem more like he was actually in high school. 

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'The Hangover' (2009) - The actors really got into character, creating many improvised and politically incorrect lines. One such famous line is when Zach Galifianakis pretends that the baby is masturbating.

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'Terminator 2: Judgment Day' (1991) - The original screenplay set Arnold Schwarzenegger's character to be blown up at the end, but instead the actor said, "I need a vacation" and the rest is history.

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