Roy Scheider’s “You’re gonna need a bigger boat,” Robert De Niro’s “You talkin’ to me?,” Harrison Ford shooting a swordsman because he was too sick to swing a whip: Some of the best improvised movie lines and moments were never written down at all. You won’t always find yourself on a set that encourages improvisation and off-script riffs, but Hollywood history is full of unforgettable quips and gestures that were completely off-the-cuff and are now in the books for good. Here are 20 of the greatest unscripted movie scenes of all time, from golden age Hollywood until now.
1. “Casablanca” (1942): “Here’s looking at you, kid”
Widely considered one of the greatest screenplays ever written, “Casablanca” didn’t script its most famous line. The script originally read, “Here’s good luck to you, kid,” but Humphrey Bogart had been using “Here’s looking at you” as a toast while teaching Ingrid Bergman poker between takes, and he slipped his version into the Paris flashback—then again in the tarmac farewell. The ad-lib endures because it’s intimacy disguised as flippancy: Rick can’t say “I love you,” so he says it indirectly. It’s a master class in how the best improvised movie lines reveal character rather than break it.
2. “Midnight Cowboy” (1969): “I’m walkin’ here!”
Between “The Graduate” (1967), “Midnight Cowboy,” and “Rain Man” (1988), there’s little doubt that Dustin Hoffman is among the greatest actors of his generation, and this off-the-cuff scuff with a New York City taxi just about seals the deal. Hoffman has said a real cab ran a red light during a guerrilla-style street shot; he started to yell, “We’re shooting a movie here!” but stayed in character as Ratso Rizzo and slammed the hood instead: “I’m walkin’ here!” The line—No. 27 on the American Film Institute’s list of the top 100 movie quotes—works because it fuses actor and character into one beat of pure New York defiance.
3. “A Clockwork Orange” (1971): “Singin’ in the Rain”
In one of the most disturbing scenes in “A Clockwork Orange” (and that’s really saying something), Alex (Malcolm McDowell) and his droogs invade an unsuspecting couple’s home. After days of takes that weren’t working, director Stanley Kubrick asked McDowell if he could dance; the actor spontaneously broke into “Singin’ in the Rain,” the only song he knew all the words to. Kubrick reportedly rushed to buy the rights within days. The improvisation is so effective because the cheery standard turns violence into performance, which is precisely how Alex experiences it.
4. “The Godfather” (1972): Don Corleone’s cat
Francis Ford Coppola’s masterpiece has several famous unscripted flourishes—Richard Castellano’s ad-libbed “Take the cannoli” turned the scripted “Leave the gun” into an all-timer—but our favorite is the opening scene. The cat purring in Marlon Brando’s lap wasn’t in the script. Coppola has said he found a stray wandering the studio and placed it in Brando’s hands without a word, moments before cameras rolled. The animal purred so loudly it nearly drowned out Brando’s dialogue, but the image was worth it, showing the tender and terrifying shades of Don Vito Corleone from the film’s first minutes…and launching a thousand cat-stroking villains.
5. “Jaws” (1975): “You’re gonna need a bigger boat”
After coming face-to-face with the shark for the first time, can you blame Chief Brody (Roy Scheider) for sizing up his woeful vessel? Screenwriter Carl Gottlieb has explained that “You’re gonna need a bigger boat” was a running crew joke that everyone said whenever the production’s undersized support barge caused problems. Scheider ad-libbed it into multiple takes until it stuck. What would become the film’s defining line works because it deflates an impossible moment with gallows humor while telling us exactly how much trouble everyone is in.
6. “Taxi Driver” (1976): “You talkin’ to me?”
All the script said was that Travis Bickle talks to himself in the mirror. Robert De Niro filled the silence himself, and “You talkin’ to me?” soon became one of the most-quoted improvised movie lines in history. Scorsese has said producers were pressuring him to wrap for the day, but he stayed on the scene while De Niro repeated and rearranged the phrase like a man rehearsing his own menace. That’s why it works: Travis is an actor with no audience, workshopping a tough-guy persona that doesn’t fit.
7. “Annie Hall” (1977): The cocaine sneeze
When Alvy Singer (Woody Allen) is handed a box of very expensive cocaine, he sneezes directly into it, sending a $2,000-an-ounce cloud into the air. The unplanned sneeze was a genuine accident during filming that made the crew and, later, test audiences laugh so hard that editors reportedly had to add extra screen time after the gag so viewers wouldn’t miss the next lines. It works because it’s the perfect physical punchline for Alvy, a man so constitutionally incapable of being cool that even his body sabotages him. Sometimes the best improvisation in movies isn’t a choice at all; it’s a happy accident a director is smart enough to keep.
8. “The Shining” (1980): “Here’s Johnny!”
Believe it or not, Stanley Kubrick never scripted Jack Nicholson snaking his head through the splintered door. The actor improvised “Here’s Johnny!”—a riff on Ed McMahon’s nightly introduction of Johnny Carson on “The Tonight Show”—during one of Kubrick’s notoriously numerous takes. The reference reportedly almost didn’t survive, since Kubrick (who was living in England) wasn’t familiar with the catchphrase. It works because the sunny showbiz greeting colliding with an ax attack is an exceptionally eerie juxtaposition.
9. “Star Wars: The Empire Strikes Back” (1980): “I know”
This is one of several times Ford pops up on this list (are you all that surprised?). Moments before Han Solo is frozen in carbonite, Princess Leia (Carrie Fisher) finally says, “I love you,” and the script had Han answering “I love you, too.” Ford hated the line, and after working the scene over with director Irvin Kershner, take after take, he dropped in the reply that stuck: “I know.” Kershner called cut and declared, “That’s Han Solo.” The ad-lib endures because it keeps the character’s swagger intact at his most vulnerable moment.
10. “Raiders of the Lost Ark” (1981): Sword vs. gun
As the story goes, director Steven Spielberg planned an elaborate, pages-long duel between Indiana Jones’s bullwhip and a showboating swordsman. But like much of the crew, Harrison Ford was suffering through dysentery in the Tunisian heat and could barely stand, so star and director landed on a shortcut moments before shooting: Indy watches the sword-twirling display, sighs, and simply shoots the man. The improvised solution became the character’s defining joke, plus proof that production problems can give a film its best beat.
11. “The Breakfast Club” (1985): The detention confessions
Director John Hughes rehearsed his young cast like a stage play, then shot the film largely in chronological order to let the five strangers’ onscreen bond grow in real time. By the emotionally climactic circle scene, where each student confesses why they landed in Saturday detention, Hughes gave the actors the broad strokes and let them ad-lib the details. That freedom produced some of the film’s most quoted moments, including Allison’s, “When you grow up, your heart dies” and Brian’s fake ID “so I can vote.” The improv works because the unscripted, slightly unpolished speech matches the scene theme about teenagers dropping their masks.
12. “Goodfellas” (1990): “Funny how?”
Tommy DeVito’s (Joe Pesci) line “Funny how? I’m a clown? I amuse you?” during his interrogation of Henry Hill (Ray Liotta) grew out of something that actually happened to Pesci as a young waiter, when he told a mobster he was funny and the compliment landed badly. Pesci shared the story with director Martin Scorsese, who had Pesci and Liotta develop the exchange in rehearsal, then deliberately left it out of the shooting script so the rest of the cast’s nervous reactions would be genuine. The scene works because nobody onscreen (or in the theater) knows whether Tommy is joking, which is the entire point of Tommy.
13. “Pretty Woman” (1990): The jewelry box snap
Julia Roberts had the magic to make any ’90s rom-com a classic, but in this scene from “Pretty Woman,” she wasn’t acting. The snap of the box on her fingers when Richard Gere’s Edward presents Vivian with a necklace was a prank cooked up by director Garry Marshall, who told Gere to “wake her up a little” and intended the gag for the blooper reel. Roberts’ startled, full-body laugh was so genuine that the moment went in the final cut and became, according to Marshall, the trademark of the movie. The improv crystallized Roberts’ star quality in a single reaction.
14. “The Fugitive” (1993): “I don’t care!”
Tommy Lee Jones’s Deputy U.S. Marshal Samuel Gerard is the determined cat to Harrison Ford’s mouse, Dr. Richard Kimble. Cornered in a storm drain, Kimble insists, “I didn’t kill my wife!”—and Gerard fires back, “I don’t care!” The exchange was boiled down on set from pages of dialogue. Drawing on the real deputy marshal he’d shadowed (who told him a fugitive’s guilt or innocence wasn’t his job to decide), Jones rejected take after scripted take until the three words that defined the character emerged. It’s a perfect example of improv as compression—one line that tells you everything about a man’s one-track professionalism.
15. “Lost in Translation” (2003): The whisper
Adding another Coppola to the mix, Sofia Coppola’s “Lost in Translation” is a career highlight for Bill Murray, an actor famous for his improv finesse. In the final scene, Bob (Murray) whispers something inaudible to Charlotte (Scarlett Johansson), and what he said remains one of cinema’s great mysteries. Coppola has explained the plan was to record replacement dialogue in postproduction, but nothing they tried could sum up the moment, so she kept Murray’s private, unscripted farewell. The choice works because the film is about connection that language can’t carry; the one line we most want to hear is, fittingly, lost.
16. “The Dark Knight” (2008): The Joker’s slow clap
Heath Ledger’s Joker is a bone-deep portrait of chaos, and one of its creepiest grace notes was reportedly invented on the spot. As the precinct applauds Commissioner Gordon’s (Gary Oldman) promotion, the camera finds the Joker in his holding cell, joining in with a slow, mocking clap—unscripted, but kept by director Christopher Nolan. It lands because it inverts the room’s emotion without a single word: everyone else is celebrating a victory, and the Joker is applauding the setup of his own punchline.
17. “Get Out” (2017): Rod, TSA hero
Jordan Peele’s Oscar-winning script left deliberate room for Lil Rel Howery to riff as Rod Williams, the TSA agent–best friend who becomes the film’s comic relief and, ultimately, its cavalry. Howery has said lines like “the TSA tingles” and much of his police-station rant were improvised on the spot. The riffing works because Rod is the one person reacting to the horror the way viewers might, so his loose, conversational delivery makes the film’s most terrifying premise feel real. It’s also proof that improvisation belongs in horror as much as comedy, since the two genres run on similar timing.
18. “Thor: Ragnarok” (2017): “He’s a friend from work!”
Director Taika Waititi has estimated that roughly 80% of “Thor: Ragnarok” was improvised, but the film’s most beloved line has the best origin story of any entry here. When the Hulk bursts into the Grandmaster’s arena, a delighted Thor (Chris Hemsworth) shouts, “We know each other—he’s a friend from work!” Hemsworth was delivering a line pitched to him between takes by a child visiting the set through the Make-A-Wish Foundation. The joke lands because it’s gloriously mundane, reducing two gods and monsters to office small talk.
19. “Once Upon a Time in Hollywood” (2019): Rick Dalton’s trailer meltdown
Director Quentin Tarantino’s scripts are famously airtight, which makes this one of the most surprising improvised scenes in recent memory. Leonardo DiCaprio pushed for his fading TV star character, Rick Dalton, to blow his lines on set. Inspired by Robert De Niro’s mirror scene in “Taxi Driver” (1976), Tarantino staged an unscripted trailer freakout, feeding DiCaprio topics to rage about while the actor improvised the self-lacerating rant. Tarantino has said he’d never seen DiCaprio so nervous. That vulnerability is the scene: an actor terrified of failing, playing an actor terrified of failing, with no script to catch either of them.
20. “Sinners” (2025): Delta Slim sings through the hurt
Toward the beginning of Ryan Coogler’s blues-soaked vampire epic, Delta Slim (Delroy Lindo) rides in the car with Sammie (Miles Caton) and Stack (Michael B. Jordan). He recounts watching a friend lynched by a white mob—and then, in a choice Lindo made in the moment, his grief slides out of speech and into song. Lindo has said he improvised the transition at the very end of the scene, and Coogler has credited the unscripted moment with giving the film more soul. (Lindo also successfully lobbied Coogler to restore the fuller version of the monologue after an early cut trimmed it.) The improvisation works because it shows that sometimes words aren’t enough to depict the depths of grief.
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