"In Monty Python's Life Of Brian The Soldier's Reaction During The Famous Biggus Dickus Scene Is Completely Genuine. He Was An Extra Who Had Been Told Simply Not To Laugh And Had No Idea What Was About To Happen"

1

"In The Chronicles Of Narnia: The Lion, The Witch And The Wardrobe (2005), When Lucy First Enters Narnia, Her Reaction Is Genuine. The Director Purposefully Never Showed His Actress The Set. He Also Did The Same With Edmund's Actor"

2

"In Die Hard (1988), When Filming Gruber’s Death Scene, Rickman Was Told He Would Be Dropped On The Count Of Three. The Director Counted To Two Before Dropping Him, Making His Reaction Genuine"

3

"For The Chestburster Scene In Alien (1979) The Effects Used To Achieve The Scene Were Deliberately Kept Secret From The Actors Who's Reactions Of Surprise And Shock Were Completely Genuine"

4

"Et Was Filmed In Chronological Order And None Of The Kids Had Seen The Puppet Before Filming, So Their First Impressions Were Totally Real"

5

"In Rocky (1976), When He Runs Through The Italian Marketplace, The People's Amused Expressions As They Look On Is Genuine, As They Had No Idea Why A Man Was Running Back And Forth Being Followed By A Van. The Man Who Throws Him The Orange Was Completely Improvised"

6

"The Lineup Actors, 'The Usual Suspects' - Benicio Del Toro Kept Farting During Filming And The Actors' Laughter Made It Into The Final Cut"

7

"In The Fugitive [1993], Harrison Ford (Playing The Framed Dr. Kimble) Was Not Provided A Script For The Interrogation Scene. His Answers And Mounting Frustration With The Detectives Were Improvised In Order To Seem More Genuine"

8

"Julia Roberts, 'Pretty Woman' - Richard Gere Unexpectedly Snapped The Jewelry Box Shut, And Her Surprise Was Real"

9

"When Julia Stiles Read Her Poem At The End Of Ten Things I Hate About You (1999) It Was Done In One Take And She Wasn't Supposed To Start Crying"

10

"In The Dark Knight (2008), Joker Is Constantly Licking His Lips. This Is Actually Because Of The Prosthetic Scars That Heath Ledger Wore. They Kept Falling Off, So Heath Would Lick His Lips To Keep Them In Place. Gradually, It Became A Part Of The Joker’s Character"

11

"Will Ferrell's Reactions During The Jack-In-The-Box Scene Were Genuine. The Director Surprised Him Every Time By Triggering The Toys With A Remote Control"

12

"Dustin Hoffman, 'Midnight Cowboy' - 'Hey, I'm Walkin' Here!' Was His Reaction To Real New York Traffic"

13

"Viggo Mortensen, 'The Two Towers' - He Broke His Toe While Kicking A Helmet In Frustration, Eliciting A Real Scream Of Anguish"

14

"Cary Elwes Wasn’t Acting When He Got Hit In The Head In Princess Bride"

15

"In one scene in Princess Bride, Cary Elwes’ character Westley gets clonked on the head pretty hard by the six-fingered man, played by Christopher Guest.

But when it came time to film the scene, the stunt didn’t look realistic enough. So Elwes suggested that Guest knock him as hard as he could using a real metal sword.

"Because of the angle, we couldn't sell a fake blow well enough for the camera, so I told him to just hit me hard," Elwes wrote in his book, As You Wish.

"And that’s the last thing I remember. I woke up in the hospital.""

"To Prepare For Saving Private Ryan, All The Main Cast Members Were Sent To A Harsh 10-Day Boot Camp, Except For Matt Damon, Who Stayed In America. Matt's Character Was Resented By Everyone, And He Was Purposefully Excluded So That The On-Screen Hostility Would Be As Realistic As Possible"

16

"Camp may be the place for bonding, but this boot camp was really tough, and the fact that Matt was at home relaxing definitely created a divide. It was so horrible that after day four, everyone wanted to quit, but Tom Hanks encouraged them to stick it out. Matt said that when he eventually showed up on set there some resentment from the guys, and it translated onto the screen."

"To Recreate The Revolutionary Spirit, The Cast Of Les Miserables Were Told To Build A Barricade In 10 Minutes. The Cameras Were Rolling And What They Made Ended Up Being Used In The Final Film"

17

"The actors didn’t know where the cameras were placed and it looked like complete chaos, but the structure turned out to be quite realistic and just needed a bit of drilling to remain held together"

"In The Princess Diaries (2001), The Scene Where Mia Trips And Falls In The Bleachers Wasn’t A Part Of The Script. Anne Hathaway Had Accidentally Slipped In A Puddle. Director Garry Marshall Liked It So Much That He Decided To Keep It In The Movie"

18

"In Se7en [1996], Fincher Never Told John C. Mcginley That The Corpse Used For 'Sloth' Was Actually A Living Actor In Heavy Makeup. Mcginley's Character's Initial Shock When 'Sloth' Wakes In The Movie Was In Fact Mcginley's Genuine Surprise From The First Take"

19

"Michael J. Fox In ‘Back To The Future Part III’"

20

"In one scene, Marty gets strung up on the famous Hill Valley clock tower. In what was without a doubt something he later regretted, Fox said “Sure” to performing the stunt himself.

The plan was for him to use his hand to keep the noose from tightening around his neck and actually strangling him. In practice, he couldn’t get his hand into position and actually blacked out for a minute, until the crew realized what was happening and saved his life."

"In Willy Wonka & The Chocolate Factory (1971), When The Kids First See The Chocolate Room, Their Reactions Are Genuine. Director Mel Stuart Took Great Care To Ensure That None Of The Child Actors Saw The Gigantic Set As It Was Being Built"

21

"Everyone On Titanic Knew That The Water Was Gonna Be Cold, But They Weren't Prepared For Just How Freezing It Was. The Water Was So Icy That Kate Winslet Couldn't Stop Shaking During The Axe Scene"

22

"Due To A Miscommunication On The Set Of The Hateful Eight, Kurt Russell Accidentally Smashed A 140-Year-Old Antique Guitar Instead Of The Prop"

23

"In the scene, you can see Jennifer Jason Leigh break character and scream and look at the crew because she was in disbelief when the antique guitar – which was supposed to be swapped out with a prop in between takes – got smashed.

The old guitar, which was made in 1870, was actually on loan from a museum. Dick Boak, the museum's director, changed their policy because of this mishap and said, "As a result of the incident, the company will no longer loan guitars to movies under any circumstances.""

"The Office"

24

"It was hard for the actors to say goodbye to Steve Carell. That's why in the scene Pam rushes in the airport to say goodbye to Michael the emotional performance by Jenna Fisher was not a performance at all"

"Matt Damon, 'Good Will Hunting' - The Fart Story Was Improvised, And Damon's Laughter Was A Real Reaction"

25

"In The Graduate (1967) Final Scene, The Director Got The Actors Expression For The Scene By Just Not Telling Them When He Was Going To Cut. There Was Nothing In The Script That Would Imply Their Facial Expressions Changing, He Just Had The Camera Running To Feel Their Energy Naturally Dissipate"

26

"At The End Of Pirates Of The Caribbean: Dead Man's Chest (2006), When A Certain Character Returns From The Dead, The Cast Shows Genuine Surprise. The Character's Return Had Been Kept A Secret By The Writers- They Even Went Uncredited"

27

"The Moment Katniss Sees Peeta's Sunken Face On TV After He's Abducted By The Capital Is Dark What's Even More Heartbreaking Is That Katniss's Reaction Is Actually How Jennifer Lawrence Responded To Seeing The Video For The First Time. The Director Knew J Law Hadn't Seen Josh Hutcherson In A While And If She Was Shocked With The Video They'd Be Able To Capture Her Genuine Fear On Camera Talk About Intense Method Acting"

28

"Jason Segel Didn’t Know His Character’s Father Was Going To Die On “How I Met Your Mother”"

29

"The Shining"

30

"The meticulousness with which the film was created had a cost: Shelley Duvall’s wellbeing. Kubrick tormented the actress, making her do relentless takes, while verbally abusing her and dismissing her acting talent. This was intentional, as revealed in The Making of The Shining. Stanley Kubrick’s daughter, Vivian Kubrick, described how her father terrorized Duvall in order to make the insecurity of her character viscerally apparent."