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    17 Famous Movie Lines That Were Geniusly Improvised

    “You're gonna need a bigger boat" started as an inside joke!

    Improvisation is a sword most actors learn how to wield. However, only the ones who've mastered the art can come up with an absolutely killer line on the spot, often making for some of the most memorable movie moments.

    Here are 17 iconic movie lines actors came up with on the spot:

    1. Roy Scheider improvised the line "You’re gonna need a bigger boat!” in Jaws because it was an inside joke among the cast and crew.

    Rob is shocked by the size of the shark

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    Universal Pictures

    2. The scene in Black Panther where M'Baku leads the Jabari men in grunting at Everett Ross for speaking out of turn was entirely Winston Duke's idea.

    M'Baku grunts to cut Ross off

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    Marvel / Via youtube.com

    3. When Princess Leia told Han Solo "I love you" in The Empire Strikes Back, Harrison Ford replied with "I know" because he thought it fit his character better than the scripted response.

    Han delivers the line before he's taken into captivity

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    Lucasfilm / Via youtube.com

    4. Matthew McConaughey was thrown into a scene in Dazed and Confused last minute with no lines written, so as soon as the director called "Action!" he said, "Alright, alright, alright!”

    Wooderson drives up to invite the girl he likes to a party

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    Gramercy PIctures / Via youtube.com

    5. Tony Stark originally wasn't supposed to reveal his superhero identity at the end of Iron Man, but at the last minute, Robert Downey Jr. added, "I am Iron Man."

    Tony reveals his identity at the press conference

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    Marvel / Via youtube.com

    6. Bill Murray improvised most of Peter Venkman's lines in Ghostbusters, including his iconic response to getting slimed: "I feel so funky.”

    Peter is knocked to the floor by a slime blast from a ghost

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    Columbia Pictures / Via youtube.com

    7. While filming a fight scene in Fight Club, Edward Norton surprised Brad Pitt by hitting him in the ear, so Brad's response of "Why the ear?" was genuine.

    Brad cups his ear in pain

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    20th Century Fox / Via youtube.com

    8. During the last week of filming for Taxi Driver, director Martin Scorsese locked himself and Robert De Niro in a room and asked the actor to say something in the mirror, so Robert came up with, “You talkin’ to me?"

    Robert talks to himself in the mirror

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    Columbia Pictures / Via youtube.com

    9. Shooting on Casablanca began with an unfinished script, so as Rick and Ilsa said their goodbyes, Humphrey Bogart ad-libbed the line "Here's looking at you, kid."

    Rick urges Ilsa to get on the plane and leave with her husband

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    Warner Bros. / Via youtube.com

    10. When Murray shaves his head during the party scene in Clueless, Donald Faison said, "I'm keeping it real!" because he heard a younger neighbor say it.

    Dionne catches Murray getting his head shaved in the bathroom

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    Paramount Pictures / Via youtube.com

    11. While filming the scene where Forrest meets Bubba in Forrest Gump, Tom Hanks came up with the line, "My name’s Forrest Gump. People call me Forrest Gump."

    Forrest meets Bubba on the army bus

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    Paramount Pictures / Via youtube.com

    12. While filming The Shining, Jack Nicholson improvised the line "Here's Johnny!" as a reference to The Tonight Show Starring Johnny Carson.

    the murderer sticks his face through the door

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    Warner Bros. / Via youtube.com

    13. While filming Anchorman: The Legend of Ron Burgundy, director Adam McKay told Steve Carrell to just say anything because he wanted Brick Tamland to have more lines, so Steve said, “I love lamp.”

    Brick says he loves the carpet, the desk, and the lamp

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    DreamWorks Pictures / Via youtube.com

    14. In Avengers: Infinity War, the line "I don't wanna go," which Peter Parker utters right before he turns to dust, was inspired by an acting technique Tom Holland uses to make himself cry.

    Peter clings to Tony as he feels himself turning to dust

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    Marvel / Via youtube.com

    15. In The Godfather, Clemenza's original line ended at "Leave the gun," but Richard Castellano added "take the cannoli" at the suggestion of his wife, Ardell Sheridan.

    Clemenza gives direction at the murder scene

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    Paramount Pictures / Via youtube.com

    16. Joe Pesci's line "Funny how?" in Goodfellas was based on a real incident from when he was a server who accidentally offended a mobster by telling him he was funny.

    Joe's character is offended at being called funny

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    Warner Bros. / Via youtube.com

    17. And finally, while filming Good Will Hunting, Robin Williams improvised an entire speech about his character's late wife that nearly made Matt Damon break character, starting with, "She used to fart in her sleep. One night it was so loud it woke the dog up."

    Robin can hardly keep from laughing

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    Miramax Films / Via youtube.com