History BewareTheNiceOnes / FIlm

** In the original trilogy, Luke is trying to fight Vader calmly and peacefully. Until Vader threatens to corrupt [[BerserkButton Leia]]. Luke promptly bellows, charges, beats Vader down, lops off his hand and barely restrains himself from killing him.

** Do NOT call Pumbaa a [[BerserkButton pig]] or you will get your ass handed to you in so many ways.
** Also, Simba and Nala, and Rafiki, they prefer not to fight, but boy, when they do...

** In the original trilogy, Luke is trying to fight Vader calmly and peacefully. Until Vader threatens to corrupt [[BerserkButton Leia]]. Luke promptly bellows, charges, beats Vader down and lops off his hand.

* In Fassbinder's ''Berlin Alexanderplatz'' Franz Biberkopf is a once-feared, now-passive ex-con, just released after serving a sentence for the murder of his girlfriend. He endures insult on top of injury throughout the 12-hour film. Only in the epilogue, when it is revealed to him that much of his torment was intentional, does he crack and declare (while grinning and laughing maniacally) that he'll make his tormentor sorry. (Biberkopf is supposed to be a metaphor for the German people in the 1920s.)

* In ''Film/XMenDaysOfFuturePast'', pressing Hank's BerserkButton[[note]]Hurting Raven[[/note]] might lead to him strangling you. [[Film/XMenFirstClass Jekyll and Hyde indeed.]]

* ''Film/EdwardScissorhands'' is a shy, artistic soul who lets everyone push him around. He seems to have no idea how to fight... until someone he loves is threatened. Then he'll kill the offender with a single arm thrust.

--->'''Billy''': I don't know. I guess they pushed him too far.

* The title character from ''WesternAnimation/TheIronGiant'' is a GentleGiant that lost his memories when he crashlanded on earth and befriends a local boy. [[spoiler: But when he thinks that the boy is killed during an attack by the army he turns into a literal killing machine armed with WaveMotionGun, ChestBlaster, and FrickinLaserBeams and [[http://www.youtube.com/watch?v=wBlweHRITsA destroys, no, ''annihilates'' the army with terrifying ease.]]]]

* From UndercoverBrother Lance is probably the nicest and most friendly member of Undercover Brother's crew, but whatever you do don't under any circumstances ever call him a sissy, [[http://www.youtube.com/watch?v=5XymelxbVpA the result is not pretty]]. What makes it funny or rather disturbing, it's Creator/NeilPatrickHarris that does the results. Says a lot about what [[WebVideo/DoctorHorriblesSingAlongBlog Dr. Horrible]] could do...

*** DOTM: "We will ''kill them all.''" That is the most disturbing yet awesome thing you can hear Optimus Prime say. Epic amounts of slagging soon follow. Also at the end of DOTM when Megatrons attempts to broker a truce between the two factions

--->'''Optimus Prime''': Time to find out (Optimus [[spoiler:grabs his axe, buries it in Megatron's head and then uses it to yank it off his body.]])

* The plot twist in ''Film/HarryPotterAndThePhilosophersStone'' with Quirrell. He is quiet and nervous throughout the entire film but then [[spoiler: it is discovered that it was all a facade HE is in fact the bad guy and not Snape, who the main characters suspect all through the film, and also he has Voldemort IN THE BACK OF HIS HEAD!!!]]

* ''RobRoy'' [=MacGregor=] just wants to farm his land, play with his children, and make love to his beautiful wife. When some jerkass Englishman generally destroys everything he has built up...

* ''MeMyselfAndIrene''. The introvert, kind Charlie has put up with so much crap under his life that he finally simply snaps...and [[JekyllAndHyde adopts a different personality.]]

* ''Film/{{Taken}}'' ; Brian Mills is a nice guy who retired from a high-stress, constantly on call government job to re-establish a relationship with his adored daughter. We see him shopping for her birthday present, barbecuing with some friends. He does use non-lethal force to bodyguard a pop star , but ends up comforting her like the father he is (and could be, to her). Then some Eurotrash scum kidnap his daughter, and though he offers them a chance to give her up and walk away, [[TooDumbToLive they don't]]. In the mayhem that follows, [[PapaWolf Mills]] doesn't flinch from shooting his FRIENDS when necessary. "Apologize to your wife for me", indeed.

* ''Fresh:'' A 12-year old boy in a gangster-ruled ghetto, getting [[ChessMotifs speed chess lessons]] from SamuelLJackson. Well, he's dead mea... [[ThePlan wait, what?]]

* "'Film/{{Taken}}'' ; Brian Mills is a nice guy who retired from a high-stress, constantly on call government job to re-establish a relationship with his adored daughter. We see him shopping for her birthday present, barbecuing with some friends. He does use non-lethal force to bodyguard a pop star , but ends up comforting her like the father he is (and could be, to her). Then some Eurotrash scum kidnap his daughter, and though he offers them a chance to give her up and walk away, [[TooDumbToLIve they don't]]. In the mayhem that follows, [[PapaWolf Mills]] doesn't flinch from shooting his FRIENDS when necessary. "Apologize to your wife for me," indeed.

* Harold of ''Film/HaroldAndKumarGoToWhiteCastle''. You do ''not'' want to be on the other side of his TranquilFury.

* StarWars:
** Yoda, when [[CrowningMomentOfAwesome facing a Sith Lord]] in ''AttackOfTheClones''. In ''RevengeOfTheSith'', he gets even better, decapitating two troopers with a single blow.

* Many of the characters of ''CrocodileDundee'' fit well here, especially Mick, Sue and Donk.
* That poor abused housewife? Maybe you should stop pushing her once she's hit [[AttackOfThe50FootWoman 50 feet.]]
* Nishi in Akira Kurosawa's ''The Bad Sleep Well.'' So quiet, so polite, such a good secretary! But the film is [[ShoutOutToShakespeare influenced]] by ''Hamlet''...

* Played with in ''Film/Witness'', where a group of teenagers harass the Amish that John Book is staying with, not realizing Book [[spoiler: is actually a cop in hiding, and ]] has no qualms giving the main bully a well-deserved ass-whooping, which he promptly does.

* Optimus Prime in ''Film/{{Transformers}}: Revenge of the Fallen''. Sure, he's Optimus Prime, who willingly takes orders from humans, and would like nothing more than to find a diplomatic solution to the war that wouldn't mean killing any more of his kind, but let us not forget that he's supposed to be the single greatest Autobot warrior of all time. In ''Revenge'', he fights Megatron, Starscream and Grindor, all at the same time. To a standstill. And kills Grindor. And comes close to killing Starscream before [[getting backstabbed by Megatron.]]

*** DOTM: "We will ''kill them all.''" That is the most disturbing yet awesome thing you can hear Optimus Prime say. Epic amounts of slagging soon follow.

* The ''[[{{Film/Scream1996}} Scream]]'' series seems to employ this with their killer(s). They are nice and friendly, able to help with whatever. But they harbor a lust for killing and target and kill those closest to Sidney Prescott or those closest to her or just people in the town she's in. Notable case is [[spoiler:Charlie Walker]]. [[spoiler:He]] is just a normal teenager and [[spoiler:a Randy clone, which he basically acts like The MetaGuy. Then he stabs [[HaydenPanettiere Kirby]] [[TheLadette Reed]] in the stomach, twice. And then reveals himself to be one of the Ghostfaces.]] Damn.

* The ''[[Film/Scream1996 Scream]]'' series seems to employ this with their killer(s). They are nice and friendly, able to help with whatever. But they harbor a lust for killing and target and kill those closest to Sidney Prescott or those closest to her or just people in the town she's in. Notable case is [[spoiler:Charlie Walker]]. [[spoiler:He]] is just a normal teenager and [[spoiler:a Randy clone, which he basically acts like The MetaGuy. Then he stabs [[HaydenPanettiere Kirby]] [[TheLadette Reed]] in the stomach, twice. And then reveals himself to be one of the Ghostfaces.]] Damn.

* Maria from ''Film/WestSideStory'' is the sweet interest to the protagonist, Tony. She doesn't seem to convey too much emotion at first (except when she finds out her brother is killed), but once she sees [[spoiler: Tony killed due to gang violence and hatred]]) at the end of the movie, she completely blows up in front of everyone.

* The Scream series seems to employ this with their killer(s). They are nice and friendly, able to help with whatever. But they harbor a lust for killing and target and kill those closest to Sidney Prescott or those closest to her or just people in the town she's in. Notable case is [[spoiler:Charlie Walker]]. [[spoiler:He]] is just normal teenager and [[spoiler:a Randy clone, which he basically acts like The MetaGuy. Then he stabs [[HaydenPanettiere Kirby]] [[TheLadette Reed]] in the stomach, twice. And then reveals himself to be one of the Ghostfaces.]] Damn.

* Obi-Wan Kenobi is a [[NiceGuy calm, friendly fellow]] who puts up with a truly horrible life [[StoicWoobie without complaint]]. However, it's never wise to kill people close to him, as [[HalfTheManHeUsedToBe Darth Maul]] and a young [[AnArmAndALeg Darth Vader]] found out.

* Obi-Wan Kenobi is a [[NiceGuy calm, friendly fellow]] who puts up with a truly horrible life [[Stoic Woobie without complaint]]. However, it's never wise to kill people close to him, as [[HalfTheManHeUsedToBe Darth Maul]] and a young [[AnArmAndALeg Darth Vader]] found out.

* Obi-Wan Kenobi is a [[Niceguy calm, friendly fellow]] who puts up with a truly horrible life [[Stoic Woobie without complaint]]. However, it's never wise to kill people close to him, as [[HalfTheManHeUsedToBe Darth Maul]] and a young [[AnArmAndALeg Darth Vader]] found out.

* The plot twist in ''Film/HarryPotterandthePhilosophersStone'' with Quirrell. He is quiet and nervous throughout the entire film but then [[spoiler: it is discovered that he is the bad guy and not Snape, and has Voldemort IN THE BACK OF HIS HEAD!!!]]