I’ve always enjoyed watching clips of deleted scenes and botched takes from my favorite films. These moments not only make me want to rewatch the film, but they also allow me to see how iconic scenes were created.

But the most surprising thing is that many famous lines and scenes that viewers assume are part of the script were actually accidental or invented by the actors on the spot.

Titanic (1997)

The line “I’m the king of the world!” has become one of the most quoted lines in film history. However, it wasn’t originally in the script.

Director James Cameron suggested that Leonardo DiCaprio say the line on set. The actor was initially hesitant, but eventually agreed—and the moment became iconic.

The Godfather (1972)

During the filming of a scene with Don Vito Corleone, a cat suddenly appeared on set and climbed into Marlon Brando’s lap. The actor started petting the animal during filming, even though it wasn’t in the script. This spontaneous moment made the scene even more natural and memorable.

The 40-Year-Old Virgin (2005)

One of the funniest scenes in the film—the chest waxing sequence—was filmed without special effects.

Steve Carell actually agreed to undergo the procedure to make the scene as realistic as possible. He later admitted that it was so painful that he would never repeat the experience.

Mrs. Doubtfire (1993)

In one scene, Robin Williams’ character’s mask was made of frosting. The hot spotlights melted it and ran it down the actor’s face.

When the frosting dripped into his teacup, Williams quickly reacted and joked, “There goes the cream and sugar.” This improvisation became one of the film’s funniest lines.

The Avengers (2012)

Robert Downey Jr. is known for his love of snacking on set. While working on The Avengers, he secretly brought food onto the set.

In one scene, the actor pulled out a bag of blueberries and began eating them during filming, offering them to his fellow actors. The actors continued playing their roles, and the moment was included in the film.

The Silence of the Lambs (1991)

Anthony Hopkins’ portrayal of Hannibal Lecter became one of the most terrifying in cinema history.

During one scene, the actor unexpectedly hissed while talking to Jodie Foster’s character. This gesture was not scripted, but the actress’s reaction was genuine.

Dirty Dancing (1987)

The famous scene where Johnny and Baby crawl toward each other on the floor was not originally planned.

In fact, the actors were warming up before filming. The director saw this moment and decided to include it in the film.

Fast and Furious 6 (2013)

One of the film’s funniest lines was improvised by Dwayne Johnson.

According to the script, his character wasn’t supposed to respond to Tyrese Gibson’s character, but the actor came up with the witty line on the spot. It ended up being much funnier.

The Wolf of Wall Street (2013)

The famous scene where Matthew McConaughey’s character thumps his chest and hums also came about by accident.

The actor said he does this exercise before filming to relax. Leonardo DiCaprio suggested using the gesture in the scene, and it became one of the film’s most memorable moments.

Rain Man (1988)

During the filming of one scene, Dustin Hoffman accidentally farted.

However, both actors stayed in character and continued acting as if everything was happening according to the script. This spontaneous moment felt so natural that they decided to leave it.