Movies are supposed to make us laugh, cry, feel nervous, or forget about reality for a couple of hours. But sometimes the stories behind them are considerably less comfortable than anything that happens on screen. A beloved performance may have come with a difficult production story, a supposedly harmless scene might have involved a disturbing reality, or a familiar movie can carry details that completely change how you think about it. These facts are not necessarily shocking for the sake of being shocking. They are simply the uncomfortable pieces of context that tend to disappear once a film becomes a classic. Once you know them, however, some movies can be surprisingly difficult to watch in quite the same way again.IMDbThe Wizard of Oz (1939) Was Much More Dangerous Than It LooksThe production involved hazardous makeup, extreme heat, heavy costumes and serious accidents, including Margaret Hamilton suffering severe burns during a special effect.cnx.cmd.push(function() {cnx({playerId: "106e33c0-3911-473c-b599-b1426db57530",}).render("0270c398a82f44f49c23c16122516796");});IMDbJaws (1975) Was Nearly Destroyed by Its Own SharkThe mechanical shark repeatedly malfunctioned in the ocean, forcing Spielberg to hide it more often and accidentally creating much of the suspense that made the movie famous.IMDbThe Shining (1980) Was an Exhausting ProductionThe shoot lasted more than a year, with extremely long workdays and an especially demanding experience for Shelley Duvall.IMDbThe Exorcist (1973) Had Real Injuries on SetSeveral physical effects were so intense that injuries suffered during production became part of the finished movie, adding an uncomfortable layer to some of its most disturbing scenes.IMDbRoar (1981) Used Real Wild AnimalsThe cast and crew worked alongside lions, tigers and other animals without the safety standards that would be expected from a modern production, and several people were seriously injured.IMDbApocalypse Now (1979) Nearly Fell Apart During ProductionThe notoriously chaotic shoot was plagued by severe weather, enormous production problems and Martin Sheen suffering a heart attack while filming.IMDbAlien (1979) Deliberately Terrified Its CastThe actors were not fully told what would happen during the famous chestburster scene, meaning their shocked reactions were largely genuine.IMDbThe Revenant (2015) Was Filmed in Brutally Difficult ConditionsMuch of the production took place in remote, freezing environments, with the cast and crew dealing with demanding locations and limited windows of natural light.IMDbBen Hur (1959) Had a Dangerous Chariot SequenceThe famous race involved genuinely hazardous stunt work, with enormous numbers of horses and vehicles moving at high speed across the set.IMDbThe Birds (1963) Used Real BirdsAlfred Hitchcock’s production relied heavily on live birds for many scenes, and Tippi Hedren later described the filming of the attack sequence as an extremely distressing experience.IMDbFitzcarraldo (1982) Really Moved a Massive BoatWerner Herzog famously had an actual 320 ton steamship hauled over a hill rather than creating the sequence with a miniature, making the production as extreme as the finished scene suggests.IMDbThe Blair Witch Project (1999) Made Its Actors Uncomfortable on PurposeThe performers were deliberately kept uncertain about what would happen next and were given instructions that allowed the filmmakers to provoke genuine reactions.IMDbThe Act of Killing (2012) Became Uncomfortable for a Completely Different ReasonThe documentary asked former Indonesian death squad members to recreate killings they had participated in, creating a film whose disturbing reality comes directly from the subjects themselves.The post 13 Movie Facts That Might Make You Uncomfortable to Hear appeared first on Den of Geek.