History Main / ViolationOfCommonSense

** In ''VideoGame/SonicTheHedgehog1'', pressing forward while moving faster than usual (usually after being launched by a spring) will ''reduce'' your speed. ''VideoGame/SonicTheHedgehog2'' and Sonic CD fixed this on the ground, but it still occurred in the air. It wasn't until ''VideoGame/Sonic3AndKnuckles'' that the problem was truly corrected.
** The iOS/Android port of ''VideoGame/SonicTheHedgehog2'' added a special hidden level to the game. How do you reach it? By falling into a certain pit in Mystic Cave Zone, which is deadly in all other versions of the game. In this version, you fall into another Zone instead of dying.
** In ''VideoGame/SonicTheHedgehogCD'', Wacky Workbench contains some large gray blocks in narrow corridors that slowly descend, then quickly slam against the ceiling. These do ''not'' crush you, as similar objects in other Sonic games (and later in the same game) do, and are not only completely harmless, but useful: letting them push you against the ceiling will drop you into an area below. It's even [[GuideDangIt necessary to use one to reach the Robotizer in Zone 1]].

[[folder:Visual Novels]]

* ''VideoGame/TalesOfPhantasia'': There's a sidequest spanning most of the past-era portion of the game, where the party goes to help a girl called Nancy buck up and go confess her feelings for a guy called Elwyn in Alvanista. Eventually, the two go to his father to get his blessing in wanting to get married, but he refuses and Klarth suggest to them to elope. They are found in a later city, with Elwyn requesting that the party not tell his father where he and Nancy have run off to, so that he won't follow and force Elwyn back home. And in order to proceed correctly with this sidequest, the party has to do ''exactly what Elwyn asked them to not do''. Not telling Elwyn's father will lead to the sidequest being abruptly ended.

* ''VideoGame/VampireTheMasqueradeBloodlines'', probably the only game in all history where in the end, handing the BigBad the {{MacGuffin}} he needs to activate his ArtifactOfDoom and then just leaving results in one of the ''best'' possible endings. Please note by this point ''everyone'' in the game with some sense of wisdom from [[BadassBookworm Beckett]] to [[MadOracle Rosa]] has told you '''not to open it yourself'''.

*** A number of [=NPCs=] are marked as doctors, meaning you can go to them to get injuries healed for money. All doctors are equally effective; the only difference is what they can do and how much they charge for their services. This means that Ada Straus, a character whose main gag is the fact that she's an IncompletelyTrained BackAlleyDoctor [[DoctorFeelgood who deals drugs on the side]], and whose dialogue includes giving a tetanus shot to make up for using rusty implements and recommending a tomato juice bath to heal radiation sickness, is one of the ''best'' choices for a doctor, since her services are cheap.

** Evrae Altanta is a boss that you can defeat the "normal" way, which involves strategic use of a side passage to evade damage. However, it has permanent Zombie status, and thus [[ReviveKillsZombie can be damaged by healing items and spells]]. In fact, throwing two Pheonix Downs at it will kill it in record time[[note]]Normally this would kill a zombified target in one hit, but Evrae Altana has the [[ContractualBossImmunity genre-standard immunity to instant death]], so it instead takes 50% of its max HP in damage, due to Phoenix Downs normally reviving the subject with half of their max HP.[[/note]]. You'd expect the easier method to be less-rewarding, but this actually allows you to swim through the main passage for a few [[PermanentlyMissableContent unique items that can't be obtained anywhere else]].

* In ''VideoGame/FiveNightsAtFreddys1'', the enigmatic Golden Freddy will instantly NonStandardGameOver you unless you immediately [[spoiler:ignore it. Just go back to your security cameras, and it'll despawn]]. The same thing applies to it when it reappears in [[VideoGame/FiveNightsAtFreddys2 the sequel]], as the Freddy head won't fool it like the other animatronics (excluding Foxy and the Puppet).

** In the UpdatedRerelease of the first game, ''VideoGame/FireEmblemShadowDragonAndTheBladeOfLight,'' simply called ''Shadow Dragon'' in the west, all but one of the secret missions are blocked to you if you have too many units in your standing army, forcing you to get some of them killed in order to access them. The last one requires you to do yet more self-destructive acts like [[spoiler: losing the [[SwordOfPlotAdvancement Falchion]] and getting Tiki killed]]. However, previous games in the series emphasized ''protecting'' your units from death at all costs, so most players wouldn't want to let so many characters die. Not only that, the requirements for how many units is "too many" remains consistently at "more than 15" for ''all'' secret chapters but the last; in a game with over 50 unique characters ''and'' technically-infinite "replacement" characters, even players who were OK with losing units would probably never see the secret chapters without intentionally killing almost every unit in the game (including, most likely, [[ShaggyDogStory the very units you could recruit in the secret missions]]).

* In the otherwise somewhat-kinda realistic alien shooter ''{{VideoGame/Contra}} III'', what's the best way to destroy a giant flying alien ship? Chase it with motorcycles, and then cling to a cruise missile that's heading for the ship! And then leap from missile to missile in the salvo as they impact uselessly on the alien's shield. Considering that you've mostly been running along the ground, climbing walls, and riding tanks so far, it's an unusually... brazen choice of attack.

** Similarly, size is completely irrelevant. What is the best choice to fight a hundred-foot long flying water dragon (Gyarados) who could swallow a human whole? How about a 10lb yellow mouse? In game, electricity has double-type-advantage for a 4x damage bonus. However, ''Film/DetectivePikachu'' shows just how lopsided this fight would be in real life.

*** In most games, water is weak to ice. Here, water type Pokemon ''resist'' ice type moves.

* In ''VideoGame/FatalFrame1'', Kirie appears at the end of the night and leaves Miku locked in a small room, with no apparent way of escape. She's not just an unbeatable ghost at this point, but she has a OneHitKill. The player is supposed to go against the basic concept of the game - avoiding and fighting ghosts - by ''letting'' her touch Miku, which causes the game to proceed to the next night.

* ''Manga/JujutsuKaisen'': [[DomainHolder Domain Expansion]] works by creating a barrier that constructs the user's [[MentalWorld Innate Domain]] within, and infusing their Cursed Technique into the barrier, [[AlwaysAccurateAttack ensuring that it will always hit any and all targets inside the Domain]]. Because the idea is to use the technique to defeat a target trapped within, the barrier is formed such that attempting to break free is almost impossible; as a consequence, however, breaking ''in'' is relatively easy precisely because there is no merit to doing so (in fact, breaking into an expanded Domain is usually considered suicidal). When Yuji forces his way into Mahito's Domain in an attempt to save Nanami, however, Idle Transfiguration, which works by [[SoulPower targeting the souls of the person Mahito is touching]], reaches [[SealedInsideAPersonShapedCan Sukuna's soul inside Yuji's body]]. Sukuna is less than pleased at Mahito touching his soul a second time (even accidentally) after warning him not to do so and delivers a powerful slash at Mahito in retaliation, which dispels his Domain and leaves him defenseless.

** In the Aglaia raid, Rhalgr has multiple variations of a MeteorSummoningAttack to pummel the party. One of said variations requires you to ignore the flashing red proximity damage marker that would normally signal certain death and stand directly under the incoming meteor. Fail to do so, and Rhalgr will punch the meteor into fragments, blasting the entire battlefield except for where the meteor was due to land.

* ''Manga/JujutsuKaisen'': [[DomainHolder Domain Expansion]] works by creating a barrier that constructs the user's [[MentalWorld Innate Domain]] within, and infusing their Cursed Technique into the barrier, [[AlwaysAccurateAttack ensuring that it will always hit any and all targets inside the Domain]]. Because the idea is to use the technique to defeat a target trapped within, the barrier is formed such that attempting to break free is almost impossible; as a consequence, however, breaking ''in'' is relatively easy precisely because there is no merit to doing so (in fact, breaking into an expanded Domain is usually considered suicidal). When Yuji does exactly that in an attempt to save Nanami from Mahito, however, Mahito's technique, which works by targeting the souls of the person Mahito is touching, reaches [[SealedInsideAPersonShapedCan Sukuna's soul inside Yuji's body]]. Sukuna is less than pleased at Mahito touching his soul a second time (even accidentally) after warning him not to do so and delivers a powerful slash at Mahito in retaliation, which dispels his Domain and leaves him defenseless.

* After rescuing Volo in ''VideoGame/BaldursGate3'', you can talk to him in your camp and bring up the fact that you've been infected with a mind flayer tadpole and ask his advice on how to get rid of it. Volo has a longstanding reputation in TabletopGames/TheForgottenRealms as a NoNothingKnowItAll of colossal porportions, so when he suggests strapping you down and letting him try to perform MeatGrinderSurgery on you with an icepick, this seems like a completely insane idea. In fact, if you let him go through with it, he'll end up cutting your eye out in his (unsuccessful) bid to remove the parasite, but will give you a magic eye that gives you permanent [[SeeTheInvisible See Invisibility]] for your trouble.

* The so-called [[https://japantoday.com/category/features/new-products/aqtas-the-deep-fryer-that-not-only-is-safe-to-add-water-to-but-uses-it-for-better-frying "Water fryer."]] This is a type of fryer that uses water to enhnace the fryer's efficiency and keeps the oil clean at the same time. However, anyone who's dealt with frying with oil will tell you that mixing water and hot oil is a ''terrible'' idea. Oil can be much hotter than water's boiling point, so throwing water on hot oil causes it to flash vaporize into steam creating an explosion of hot oil. And if there's a fire around, it will cause a conflegration. But the water fryer takes advantage of the fact that oil and water don't mix and oil is less dense than water, so the oil floats. The idea then is fill a portion of the fryer with water, then fill the rest with oil, have the heating element in the oil side, and stir the two separately in opposite directions. Some how this all works out such that the oil is still hot enough to cook, the debris from frying fall into the water layer, clean up is easy, and overall seems to work better than a traditional oil fryer. Of note though: '''Do not do this with a oil-only fryer''', you need a specialized water/oil fryer to do this safely!