History Main / DropInNemesis

* In the original ''VideoGame/{{Space Quest|I The Sarien Encounter}}'', the desert has {{sand worm}}s that devour wanderers, looking into the hole in the cliff gets you eaten alive, walking across the grate gets you pulled under and eaten, and wandering around the Deltaur's exterior gets you blasted into space dust. In ''VideoGame/SpaceQuestIIVohaulsRevenge'', if you go into the cliffside cave without the glowing gem, you get eaten by a Cave Beaver. If you fail to deactivate the hovercraft's distress beacon, Vohaul's troops will eventually track you down and kill you with a DisintegratorRay; the same thing happens if the landing platform guard spots you. If you go the wrong way in TheMaze, you get eaten by a Cave Squid. ''III'' has Arnold the Annihilator, who you must lure into a trap to obtain his InvisibilityCloak, and the Scumsoft Henchmen, who will trap you in a block of Jello if alerted. ''IV'' has the Cyborg who summons the inescapable Droid of Death, the Sequel Police, who will shoot you dead if you take a wrong turn, and the Super Computer security bots, which in addition to patrolling the complex, will immediately hunt you down if you mis-enter the code for the control room door.

* The titular ''VideoGame/AoOni'' likes to pop up both when you ''might'' expect him, such as when you've just discovered a vital item or clue, and when you're just wandering around his house. Typically, you can survive by outrunning him, or trying to hide in a cabinet... though it's not a good idea to try that while he's in the room.
Another example happens when you pick up a certain key in the basement. If you don't close the door behind you, he will rush you with no chance to move. [[https://www.youtube.com/watch?list=PLC9D32F394B208634&feature=player_detailpage&v=UnT7YPVfg5U#t=3s See it here.]]

** "VideoGame/SuperMario64'': Done very literally in the Tiny-Huge Island level. If Mario spends too much time in the two bodies of water that exist there, an InvincibleMinorMinion known as Bubba will be dropped from the sky into the water and attempt to gobble Mario up.

* This is practically the entire premise of ''VideoGame/FiveNightsAtFreddys''; letting your guard down for a single moment can easily result in one of the killer animatronics slipping in unnoticed, ready and waiti-'''[[JumpScare EEEEEAAAAAHHHHHH!!!!!!]]'''

** ''VideoGame/{{Spore}}'' features the sea monster in the creature stage that swallows you in a cutscene without warning. It doubles as BorderPatrol as well as the page image for [[NightmareFuel/{{Spore}} the game's Nightmare Fuel]]. The Grox fill this niche in the space stage, randomly dropping in and torching both your allies' colonies and sometimes yourself unless you can drive them off in time. Note that TakeYourTime is [[AvertedTrope NOT]] in effect here.

** Enter the BigBad's apartment in ''Open Season'' without first looking through the door with a [[GuideDangIt MacGyvered stick mirror]], and his dog will maul you to death. Later, he unavoidably knocks you out and empties your pockets. At this point, don't go back into the bedroom without first equipping the [[KillItWithFire lighter and hairspray]]. In the original game, you must put your gun in the locker outside the jail before uncuffing a suspect, or he will turn it against you.

** In the original Police Quest, if you don't do a search on your police cruiser, it will be booby trapped and kill you. If you do, you'll find nothing wrong and the game continues normally. Wrap your head around that logic...

** Enter the BigBad's apartment in ''Open Season'' without first looking through the door with a [[GuideDangIt MacGyvered stick mirror]], and his dog will maul you to death. Later, he unavoidably knocks you out and empties your pockets. At this point, don't go back into the bedroom without first equipping the [[KillItWithFire lighter and hairspray]]. In the original game, you must put your gun in the locker outside the jail before uncuffing a suspect, or he will turn it against you. In the first ''SWAT'' game, go around a corner without slicing the pie and the criminal will [[FailedASpotCheck ALWAYS be waiting there to shoot you]].

* In ''VideoGame/PaperMarioTheThousandYearDoor'', you're at one point given a diary by a ghost and told not to read it. If you read it anyway, the ghost reappears and kills you on the spot.
** It was reserved for plot cutscenes, but the terrifying aspect of this is evident in playing ''VideoGame/SuperPaperMario''. Consider: [[spoiler:Dimentio spontaneously appeared in Merlon's house, interrupting a conversation, to [[TotalPartyKill kill your entire party.]] Shortly after doing the same thing to Luigi]]. The unsaid implication is that, if he wanted to, he could have done that ''at any time, in any stage''...

* One screen in ''VideoGame/IWannaBeTheGuy'' is an apparently safe hallway straight out of ''VideoGame/MegaManClassic''. You must clear it quickly or else Guts Man will fall on you from out of nowhere. But [[PlatformHell nobody said this game was fair]].
** If you take too long on the Tetris screen, a giant VideoGame/DrMario pill falls on you.

* In the original ''VideoGame/JurassicPark'' game for the SNES, entering a darkened room without night vision goggles would result in your immediate death-by-unseen-dinosaur.
** The same game also had several spots on the world map where stepping into the wrong location would cause a T-Rex to suddenly appear and eat you.
* In ''VideoGame/LauraBow: The Colonel's Bequest'', [[PsychoShowerMurderParody taking a shower resulted in a homage to the infamous murder scene]] from ''Film/{{Psycho}}'', complete with the MIDI version of PsychoStrings.
** And in the second game, ''The Dagger of Amon Ra'', Laura will get run over by a car if she tries to cross the street by herself. Hilariously. Every damn time.
*** For that one, you need to look both ways before crossing the street, making the car that would normally hit you cease to exist.

* A literal case of this is Nemesis in ''VideoGame/ResidentEvil3Nemesis'', who has the habit to pop out in random corridors to chase Jill down. Sometimes even right outside a safe room, much to many a player's surprise.
* Also literally used in ''VideoGame/ResidentEvilGunSurvivor 2'', where Nemesis chases you down and kills you in one hit once the timer runs out.
* Another literal case is in the preceding game, ''VideoGame/ResidentEvil2'', in the form of the T-103 Tyrant, AKA Mr. X, who is literally dropped into the police precinct via helicopter during the second character's story arc, and [[JumpScare bursts into the room without any forewarning]] on multiple occasions as he [[ImplacableMan relentlessly hunts for the G-virus sample]].

* ''[[VideoGame/DejaVu1985 Déjà Vu II]]'' has [[TheDragon Stogie]], a supremely annoying mob goon who will magically appear to kill you should you try to stray out of town. He doesn't seem to care where you are at the time, either. Trying to ride a train out? He hopped on too. Trying to escape through the desert? No good, he's right there to get you.

* Enter the BigBad's apartment in ''VideoGame/PoliceQuest: Open Season'' without first looking through the door with a [[GuideDangIt MacGyvered stick mirror]], and his dog will maul you to death. Later, he unavoidably knocks you out and empties your pockets. At this point, don't go back into the bedroom without first equipping the [[KillItWithFire lighter and hairspray]]. In the original game, you must put your gun in the locker outside the jail before uncuffing a suspect, or he will turn it against you. In the first ''SWAT'' game, go around a corner without slicing the pie and the criminal will [[FailedASpotCheck ALWAYS be waiting there to shoot you]].

** A straighter example would be when you pick up a certain key in the basement. If you don't close the door behind you, he will rush you with no chance to move. [[https://www.youtube.com/watch?list=PLC9D32F394B208634&feature=player_detailpage&v=UnT7YPVfg5U#t=3s See it here.]]

* In ''VideoGame/{{Fallout 4}}'', if you decide to explore the shed near the swan boat pond in Boston Common, a [[LightningBruiser Super Mutant Behemoth]] named Swan will emerge to smash you with thrown boulders and a giant anchor hammer. If you don't have PowerArmor and a Fat Man on hand, or a lot of levels on you, [[CurbstompBattle you're dead meat]].

* In ''VideoGame/{{Minecraft}}'', the [[DugTooDeep Deep Dark]] normally has no monsters spawning in it, despite the [[DarknessEqualsDeath darkness]]. However, triggering a sculk shrieker by either touching it or making noise within earshot of a nearby sculk sensor [[FourIsDeath four times]] will spawn a Warden, a NighInvulnerable LightningBruiser intentionally designed to be a HopelessBossFight ''even with endgame-level equipment''. Its only weakness is that it is blind and primarily relies on its hearing to find you, which can be exploited by sneaking and making decoy noises with thrown snowballs to draw its attention away from you... however, you will find that simply staying completely still is of no help, as it can also ''smell'' you and will slowly close in on you even if you make no sound at all. And once it has a good enough guess of your location to roar and give chase, '''you are dead''': in addition to its extreme toughness (more health than the actual final boss and ''more than even the BonusBoss'') and massive melee damage (enough to kill in ''two hits max'' even if you're wearing a full suit of [[{{Unobtainium}} netherite]] armor), it also packs an [[AlwaysAccurateAttack impossible-to-dodge]] ArmorPiercingAttack that bypasses almost all defenses and even go through walls.

* In ''VideoGame/{{Fallout 3}}'', heavily-armed hit squads will be sent after you if your reputation is either [[KarmaMeter too high or too low]]. If you fast-travel to one of their spawning locations, they will appear in a scripted encounter and immediately open fire on you. If you're at a low experience level, your chances of survival are slim.

** The ''Lonesome Road'' has a literal example where if you enter a trailer on the High Road, a Deathclaw, which in this DLC is an InstakillMook that level scales with the player, drops down from the overpass and lands near the trailer entrance, likely inescapably trapping the player.

** The first example would be Deviljho, who is known for burrowing up from underneath the ground in search of food and proceeding to [[PersonOfMassDestruction murder almost everything in the area,]] more often than not including ''you.''
** Though Rajang almost never does this in the second-generation games (despite having debuted in ''Monster Hunter 2''), and outright never does it in ''4'', it started doing it in subsequent appearances, from ''4 Ultimate'' onwards. In the latter game, it is the most recurring intruder among those powered by the Apex state, and is capable of appearing in such a dangerous form as early as when you're hunting a ''Desert Seltas'' (which would otherwise be a welcoming first boss in G Rank). Then, in ''Iceborne'', it can appear on any map and will [[HairTriggerTemper jump into the fray, fists flying, if it so much as]] ''[[HairTriggerTemper sees]]'' you or another monster, even an ''Elder Dragon.'' If [[BackgroundMusicOverride its theme starts playing]], one of you is about to have a ''very'' bad time. It's even worse in the Guiding Lands, since its patrols encompass ''almost the entire locale.''
** Seregios flies in at high speed, with your only warning being the whistling its [[FeatherFlechettes scales]] make mid-flight, then [[DeathOfAThousandCuts pokes whatever's in the area to death.]]
** If Bazelgeuse is on a map with you, it'll come running in search of a free meal if it hears the distressed cry of another large monster (which it can do from a surprisingly large distance due to its acute hearing.) Once its theme [[BackgroundMusicOverride overtakes the area's battle theme]], you'd best start running or get those [[DungFu Dung Pods]] ready, else you're in for an [[StuffBlowingUp explosive surprise.]] The frequency with which it does this is such that ''Rise'' gave it the title "Party Crasher".
** Banbaro is normally a docile monster that can appear almost anywhere. If it sees you fighting another monster, however, it will ''[[BerserkButton flip out]]'' and start tossing boulders and dead trees at the both of you.
** Ebony Odogaron and Fulgur Anjanath appear in all biomes. They usually thrash the resident apex monster of the region in a Turf War, however, so it's sometimes a relief to see them charging into the fray.
** Ruiner Nergigante is constantly on the hunt for other Elder Dragons to chow down on, so it appears anywhere ''they'' can appear. It beats all of them in Turf Wars, so this can be used to your advantage; you just need to watch out for its spike attacks, which inflict [[StatusEffects bleeding.]]
** On a lesser example, Tigrex and Velkhana can appear in all but one region (the Coral Highlands and the Elder's Recess, respectively) at any time; the latter, being an Elder Dragon, will [[CurbStompBattle ruin your prey's day]], while the former, being a hyperactive, aggressive Pseudo-Flying Wyvern, will normally ruin ''your'' day instead.
** Crimson Glow Valstrax is an Elder Dragon that appears as a red comet high in the sky, then comes [[DynamicEntry hurtling down to earth.]] It can appear in Unstable Environment quests. If you see a red light in the sky, and you don't take any evasive actions, you're about to learn firsthand that a giant dragon with jet engines for wings crashing into you at Mach 5 from the stratosphere hurts a ''lot''.