[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/caltrop2.jpg]]
[[caption-width-right:249:[[AgonyOfTheFeet Watch your step.]]]]

Caltrops are tetrahedral items used for making ground hard to cover. They always land with a pointy bit sticking up. Handy for preventing pursuers from catching you, whether they are on foot or [[AntiCavalry horseback]].

Despite the caption, the one in the page image is of a design favored for their one modern use; [[PopTheTires puncturing and deflating car tires]] (the hollow spikes let the air flow out quickly and prevent self healing tires from working).

See also SpikesOfDoom.

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!!Examples:

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[[folder: Anime and Manga ]]

* The Iga ninja dogs use poisonous seeds shaped like caltrops as a trap in ''GingaNagareboshiGin''.
* In one of the ''Anime/MobileSuitGundam'' [[OriginalVideoAnimation OVAs]], the one where the Gundams are samurai, and then they are suddenly doing a ''WackyRaces parody'', the {{Ninja}} [[strike:pirate zombie]] robots use these.
* In ''Manga/StrawberryMarshmallow'', while demonstrating "real" ninja techniques, Miu dumps a snack food on the floor, calling them caltrops. She is told to clean them up.
* Usopp from ''Manga/OnePiece'' sometimes uses these, and in one of the VideoGames, he throws them on the ground as an attack.
* Early in ''Manga/{{Naruto}}'', Kakashi uses some of these to prevent Zabuza from running over to attack him while he was open.
* In ''Manga/{{Gintama}}'', Gintoki and Kagura end up becoming ninjas in order to help rescue Elizabeth in a particular story arc, and are provided with these to shake off some pursuers. However, they have no clue as to how to use them properly and start throwing them directly at their pursuers, which does slow them down still, but not much.

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[[folder: Card Games ]]

* ''TabletopGame/MagicTheGathering'' has two cards. [[http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=1640 Wall of Caltrops]] simply gains banding if it blocks with other walls. [[http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=15252 Caltrops]] deals damage to attacking creatures, [[GameplayAndStorySegregation including ones that can fly]].

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[[folder: Film ]]

* Film/JamesBond's CoolCar from ''Film/TomorrowNeverDies'' has the ability to drop a whole bunch of these to pop enemy tires and mess up pursuit. See JustForFun/TropesExaminedByTheMythBusters for a report on how well that would really work. Bond gets double points for driving over his own caltrops, and fixing and reinflating the tires with just the press of a button!
* The Batmobile in the DarkKnightTrilogy can deploy these.
* It's fairly common for scattered jacks to play this role in kid's films for AmusingInjuries among the parents.
* Parodied in Music/TheBeatles' ''Film/{{Help}}!''. The Kaili cult's disguised Harrods van has a front headlight which issues forth a stream of thumbtacks.

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[[folder: Literature ]]

* Anti-horse caltrops are mentioned in one of the ''Brother Cadfael'' novels, which are set in the mid-12th century.
* {{Sharpe}} uses these in the book version of "Sharpe's Rifles", as a defence against Colonel de l'Eclin's cavalry.
* Conena in ''Discworld/Sourcery'' uses these, though they're not explicitly referred to as such.
* Caltrops are among the ninja-esque equipment included in trainee Assassin Teppic's comically-extended LockAndLoadMontage at the beginning of ''Discworld/{{Pyramids}}''.
** In his final examination, he also has to avoid caltrops he suspects are poisoned.
* Chinese farmers in ''Lords of the Bow'' scatter caltrops over their fields to slow the advancing Mongols.

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[[folder: Live Action TV ]]

* ''Series/MythBusters'': tested and busted that road spikes could stop or slow down a pursuing car.
** Hollow ones might, but those weren't tested.
* ''Series/NinjaSentaiKakuranger'': Caltrops are one of the many tricks the rangers use.

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[[folder: Real Life ]]

* Giant versions of these called "Czech hedgehogs" were used as anti-tank defences in UsefulNotes/WorldWarII. These giant versions were usually made of steel girders welded together to resemble giant jacks. They're still used today.
* In Creator/JuliusCaesar's circumvallation of Alesia, he planted a "garden" of these on both sides of his encircling walls: to keep the Gaulish chieftains in, and the relieving army out. Basically included hidden caltrops, made of iron, followed by spiked pits, and then upward-pointing branching stakes, designed to take a horse in the chest. Followed by two trenches, one filled with water and one not, and a stockade built from the top of the far back of the second trench, which was pointed at the bottom, making it much more difficult to cross. While under fire. Oh, and ballistae and scorpions were aimed into the trench as well. Have fun and stay safe, boys.
** The Romans also [[GenreKill used them to definitely murder chariot warfare]]: while already declining on its own due the creation of effective cavalry, occasional use of [[SpikedWheels scythed chariots]] was still a danger in their wars against the Hellenistic kingdoms until they started to throw caltrops big enough to wound horses hooves but small enough that the standard-issue ''caligae'' (the heavy-soled boot-sandals of the Roman legionaries) could protect them, wait for the chariot charge to stop abruptly on the caltrops, and then calmly walk to the enemy to slaughter both horses and charioteers.
* {{Ninja}}, who swore by just about everything sneaky, were fond of dropping these. They were called ''tetsubishi'' and ''makibishi'' in Japan.
* Cops use a variant of these known as "spike strips" to disable the tires of those they're pursuing. Preferred since it is also desirable to remove the spikes as quickly as possible, otherwise [[HoistByHisOwnPetard the cop cars in pursuit would]] ''[[HoistByHisOwnPetard also]]'' [[HoistByHisOwnPetard get their tires popped]].
* During UsefulNotes/TheKoreanWar, American Air Force bombers would drop these over North Korean and Chinese supply routes at night, returning at daybreak to attack supply convoys that had become immobilized in the night by the obstacles.
** In the modern day, [[ObviousRulePatch caltrops are banned from the Infantry barracks at Fort Benning, Georgia.]]
* Any TabletopGames player who has stepped on a d4 understands acutely how these things are supposed to work: See below.
** As has any kid, or parent whose kids didn't put away their toys, who's stepped on a Lego piece.

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[[folder: Tabletop Games ]]

* ''Tabletopgame/DungeonsAndDragons'': caltrops were in the rules as far back as 1st Edition. Some are even ClockworkCreature.
* ''{{GURPS}}'': High-Tech mentions that a cheap way to make them more dangerous was to [[PoisonedWeapons cover them in dung.]]
* The standard pyramid-shaped four-sided die is sometimes jokingly referred to as such, especially if you've just trodden on one barefoot. Another popular name for them is the "Sonofabitch".
** Most modern d4s at least have flattened corners. Not so with the early boxed sets of ''Basic Dungeons & Dragons'' (the one that came out ''before'' what we now call "1st Edition"). The d4 that came with that set was easily sharp enough to put an eye out.
** When the players get angry in ''ComicStrip/KnightsOfTheDinnerTable'' and start throwing dice at one another, a common battlecry is "No 4-siders! No 4-siders!".
** Vriska from ''Webcomic/{{Homestuck}}'' has [[http://www.mspaintadventures.com/?s=6&p=004097 trouble]] with them as well.

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[[folder: Video Games ]]

* The best line of defense in ''Deathtrack''.
* The moves Spikes and Poison Spikes do this in ''Franchise/{{Pokemon}}''. They affect Pokemon when opposing trainer tries to switch {{Mons}}, unless they're of the Flying type, have the Levitate or Magic Guard abilities, or (in the case of Poison Spikes), immune to [[UniversalPoison poisoning]]. Spikes was even ''called'' caltrops in the Japanese version.
** It's possible to think of Stealth Rock as a floating version of the caltrops.
* Caltrops are a hold item in Kongregate's online game ''Kongai'' where they do 14 damage if you or your oppponent switched out if a character holding that item is in play (it used to be 10 damage).
* Part of the Scout's arsenal in ''VideoGame/TeamFortressClassic''. Apart from doing a little damage, they also slow down the victim greatly.
* ''VideoGame/{{Allegiance}}'' has caltrop mines. These look nothing like traditional caltrops, but are three-dimensional mine fields IN SPACE that are deployed at choke points, and cause more damage the faster an enemy ship travels through them, forcing it to slow down and become an easy target.
* In ''VideoGame/CityOfHeroes'', caltrops are available to certain powersets and do minor damage and massively debuff speed. Among enemies, certain Tsoo and all Knives of Artemis use them. The [=KoA=] in particular are annoying because they can quickly stack caltrops, at which point your character may as well not be able to move at all.
* Their use is inverted in ''Thievery'', a GameMod for ''VideoGame/UnrealTournament''. The tough and armored guard team can set caltrops in order to damage and slow down members of the evasive thief team. Guards are immune to their own caltrops.
* ''ShadowWarrior'' features these as an useable item. "Who put these here? Ow!"
* One of the weapons available in ''VideoGame/MiniNinjas''.
* Used by Burglars in ''VideoGame/TheLordOfTheRingsOnline''.
* ''IzunaLegendOfTheUnemployedNinja'': Izuna can scatter caltrops to damage whatever steps on the square next (possibly herself, if the player's not careful).
* In ''[[VideoGame/{{Drakensang}} Drakensang 2: The River of Time]]'', you can build these with a very low Forge lore. Of course, they can be placed as traps on the ground.
* A mainstay of the ''VideoGame/{{Tenchu}}'' series, caltrops do a small amount of damage and stun anyone (including the player) who steps on them for a short time.
* ''VideoGame/{{Shinobido}}'' features makibishi as part of your Ninja equipment along with shuriken, grappling hooks, five-colored rice and various explosive stuff. Those caltrops though [[DeathOfAThousandCuts can actually kill enemies]], but it takes some time...
* ''VideoGame/AssassinsCreedRevelations'': caltrop ''[[TrickBomb bombs]]''
* ''VideoGame/BatmanArkhamCity'': one of tools Catwoman can use.
* Caltrops are one of the trap types you can craft and deploy in ''VideoGame/DragonAgeOrigins''.
* If your ninja in the ''Shogun'' entries of the ''TotalWar'' series are detected, they will scatter a handful of caltrops behind them in an attempt to slow down the pursuers. It is often highly effective. Fun to watch, too.
* The Chill Spike from ''VideoGame/MegaMan10'' works like a spike strip (see RealLife above), damaging enemies that move onto it. Not surprisingly, it is effective against the robot/motorbike transformer Nitro Man, in the sense that it hurts his tires.
* An absolutely essential tool in the arsenal of "Grey morality" Avatars in ''VideoGame/UltimaVII''. Placed properly, you could use them to knock out mages for ease of stealing the potions they somehow managed to produce from nothing. Also a good way to knock out dragons for one-hit KO experience grinding. In the ''[[VideoGame/UltimaVIIPartII sequel]]'', it was a way to get easy victories(and thus quicker/better training) in the arena of Monitor.
* The ''VideoGame/{{La-Mulana}}'' remake adds caltrops as a subweapon.
* Some of the black-clad ninja in ''VideoGame/BadDudes'' toss ''makibishi''. If you don't have a weapon, you can low-kick them out of the way. (If you've got the nunchucks, you can possibly fire upwards at them from a lower level. If you've got the knife, you suck.)
* One of the standard wall defenses in ''Kingdoms of Camelot'' on Facebook. Best against mounted troops.
* Caltrops are one of the many traps that are scattered around the grounds in ''VideoGame/DungeonsOfDredmor''. The ones that do higher damage tend to be made of magical elements, such as Aetheral energy or Dragonsbreath.

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[[folder: Western Animation ]]

* In ''WesternAnimation/BatmanTheAnimatedSeries'', Catwoman has them... in the shape of cats, naturally. She uses them in "The Cat and the Claw" to stop Red Claw's men from pursuing her through a ventilation duct.
* Batman uses bat-shaped ones in ''BatmanUnderTheRedHood''.

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