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Getting the screenplay for a movie in perfect shape before starting filming is usually number one on any director鈥檚 鈥榯o-do鈥 list.

But sometimes an actor comes up with a line right in the middle of shooting that鈥檚 just so good it makes it into the finished film. And a few of them have become the most memorable moments in the movies.

Here are some of cinema鈥檚 greatest improvised lines.

鈥淚 don鈥檛 want to go.鈥 (Avengers: Infinity War, 2018)

Tom Holland as Spiderman
Image caption,
There have been three silver screen iterations of Spiderman so far, and Tom Holland's is the most recent

Actor Tom Holland delivered one of the Marvel Cinematic Universe鈥檚 most tearjerking lines at the climax of Spider-Man鈥檚 death scene in Avengers: Infinity War.

But his heartbreaking last words were improvised by Holland on set when directors Joe and Anthony Russo felt that Peter Parker鈥檚 final line as it had been written (鈥淚鈥檓 sorry鈥) just didn鈥檛 yank hard enough on our heartstrings. They asked Holland to play the scene again, and to say what he wanted to.

鈥淗e unlocked it emotionally, he understood what we were asking for,鈥 said Joe Russo. 鈥淭hat's [what鈥檚] in the film.鈥

鈥淗ere鈥檚 looking at you, kid.鈥 (Casablanca, 1942)

Casablanca
Image caption,
The film has been described as the most quotable of all time

There鈥檚 probably no movie line as well known as Humphrey Bogart鈥檚 to co-star Ingrid Bergman in Casablanca. But 鈥渉ere鈥檚 looking at you, kid鈥 wasn鈥檛 in the original screenplay.

In fact it was just something Bogart had said to Bergman off the top of his head while he was teaching her to play poker between scenes. (It might refer to a poker hand that includes a king, a queen and a jack as they are all 鈥榝ace cards鈥 and appear to be looking at you.) As the screenplay for the whole movie was constantly changing during filming, Bogart just inserted the line on a whim, and it became an instant classic.

鈥淗eeeere鈥檚 Johnny!鈥 (The Shining, 1980)

The Shining
Image caption,
Stanley Kubrick almost didn't keep the line in, as he lived in the UK and hadn't seen the show Jack Nicholson borrowed it from

Stanley Kubrick鈥檚 adaptation of Stephen King鈥檚 horror story The Shining is packed with terrifying moments, but one of the most nightmare-inducing is crazy caretaker Jack Torrance (Jack Nicholson) bursting through a door with an axe screaming 鈥淗eeeere鈥檚 Johnny!鈥

The line is actually how legendary American chat show host Johnny Carson used to be introduced to TV audiences every night.

Kubrick was known for filming each scene a vast number of times in order to get exactly what he wanted, and on one of those takes Nicholson improvised the line. Kubrick was so impressed that it stayed in the movie.

鈥淵ou鈥檙e gonna need a bigger boat!鈥 (Jaws, 1975)

Jaws
Image caption,
The mechanical shark was nicknamed Bruce, after Spielberg's lawyer

Steven Spielberg鈥檚 shark-attack movie Jaws was a monster hit when it came out in 1975. The story, about a small seaside town terrorised by a great white shark, finally has the town鈥檚 sheriff, played by Roy Scheider, going to sea to hunt down the malevolent fish. When he finally catches sight of it, he utters the film鈥檚 most memorable line: 鈥淵ou鈥檙e gonna need a bigger boat!鈥

In fact the improvised line was an in-joke. The filming of Jaws had been beset by problems, including a tight budget. One of the tugboats provided by the producers was clearly too small for its job, leading crew members to remark: 鈥淵ou鈥檙e gonna need a bigger boat鈥 whenever they saw it. Scheider had tried putting the quip in at various other points in the film but saw an opportunity to work the line into the film鈥檚 climax, and the rest is movie history.

鈥淗sss-ssss-ssss鈥 (The Silence Of The Lambs, 1991)

The Silence of the Lambs
Image caption,
It's one of only three films to win the 'big five' at the Oscars: best picture, director, actor, actress, and screenplay

Dr. Hannibal Lecter is widely recognised as one of cinema鈥檚 most frightening villains. In fact Sir Anthony Hopkins won an Oscar for his performance as the man-eating medic in Jonathan Demme鈥檚 The Silence Of The Lambs.

Some of the film鈥檚 most unnerving scenes happen between him and FBI agent Clarice Starling (Jodie Foster) when she interviews him in his cell. Perhaps the most bone-chilling moment is when he utters a strange slurp at her after describing how he made a meal of an unfortunate government employee.

But the bizarrre and frightening moment wasn鈥檛 in the original screenplay. Hopkins had been jokingly making the noise at Foster between takes on set, and decided to include it in the scene at the last moment.

鈥淚 know.鈥 (The Empire Strikes Back, 1980)

Star Wars - Leia and Solo
Image caption,
Fisher often had to stand on a box when filming with Ford, as he was much taller than her

The improbable love story between gruff Han Solo (Harrison Ford) and spiky Princess Leia (Carrie Fisher) was one of the highlights of the Star Wars movies. Possibly its most swoonsome moment comes when Leia finally tells Han she loves him in The Empire Strikes Back.

The screenplay called for Han just to reply: 鈥淚 love you too.鈥 But Ford came up with the much more romantic response: 鈥淚 know.鈥

鈥淟ike tears in rain鈥︹ (Blade Runner, 1982)

Blade Runner
Image caption,
It took 35 years for a sequel (Blade Runner 2049) to be released

Ridley Scott鈥檚 sci-fi classic Blade Runner is about futuristic policeman Rick Deckard (Harrison Ford) on the trail of Roy Batty, a 鈥榬eplicant鈥 (a kind of synthetic human) played by Rutger Hauer. When they finally confront each other on a rain-drenched rooftop Batty realises that his time is up and delivers one of the most poetic death speeches in movie history.

鈥淚've seen things you people wouldn't believe. Attack ships on fire off the shoulder of Orion. I watched C-beams glitter in the dark near the Tannh盲user Gate. All those moments will be lost in time, like tears in rain. Time to die.鈥

It鈥檚 become one of the most quoted scenes in movie history. But in fact it was significantly rewritten by Hauer only hours before shooting, and he added that heartstopping 鈥榯ears in rain鈥 simile.

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