11 Raiders Of The Lost Ark (1981)
The scene where Indiana Jones meets a warrior armed with a sword was scripted to be an intense duel. However, the actor Harrison Ford was ill from food poisoning and didn't have the strength to perform, so the director made a small change - instead of dueling, Indiana pulls out the revolver and shoots the villain. The scene became one of the most iconic moments in movie history.
12 Mrs. Doubtfire (1993)
The scene where Mrs. Doubtfire had to cover her face with icing didn't go as planned. When the icing started dripping down the actor's face because the heat from set lights made it melt, Robbie Williams had to improvise. At the moment when the icing dripped into Mrs. Sellner’s tea, he decided to say, “There you go, you’ve got your cream and your sugar now.”
13 Full Metal Jacket (1987)
R. Lee Ermey, who played Gny. Sgt. Hartman, was a real-life Parris Island Marine drill instructor during the war. At first, he was hired as a technical adviser but later was given a part in the film and improvised all training scenes himself.
14 The 'Burbs (1989)
The scene where Tom Hanks picks up the gurney himself and throws it into the ambulance wasn't scripted, he thought of doing it that on the spot.
15 Lock, Stock And Two Smoking Barrels (1998)
The famous scene where Nick the Greek breaks the coffee table with a juice glass wasn't scripted. In fact, it was an accident and the shocked look on the actor’s face is genuine.
16 The Revenant (2015)
Leonardo DiCaprio was so dedicated to his role in The Revenant that instead of eating fake meat, he ate an actual raw bison liver, despite being a vegetarian. No surprise that he was awarded an Oscar for this role.
17 The Dark Knight (2008)
While it's hard to imagine Jim Gordon's promotion scene without the Joker clapping sarcastically, this scene was never in the script. It is a work of Heath Ledger’s excellent improvisation.
18 Thor: The Dark World (2013)
The scene where Thor hangs his hammer on a coat rack was so good that everyone probably thought it was scripted, however, it was not. Chris Hemsworth was just trying to be funny but his improvisation was so good, the scene was put into the final cut.
19 The Usual Suspects (1995)
The line-up scene where we see characters laughing was supposed to be a serious one. The director was angry at the actors for cracking up, but they said they couldn't keep a straight face on because one of them was farting during filming.
20 Fast And Furious 6 (2013)
Do you remember one of the funniest scenes in the movie, when Roman said "Hey Mia, You better hide your baby oil" and Hobbs responded with "You better hide that big ass forehead"? Well, actor Dwayne Johnson came up with this comeback on the spot because in the script his character wasn't supposed to respond at all.