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[[quoteright:350:[[VideoGame/SuperSmashBros http://static.tvtropes.org/pmwiki/pub/images/Ness_yoyo_1565.jpg]]]]
[[caption-width-right:350:[[VideoGame/{{Earthbound}} Ness]] demonstrates, at the expense of [[VideoGame/TheLegendOfZeldaOcarinaOfTime Sheik.]]]]

->''A variation on throwing weapons, yo-yos allow you to both throw the weapon a short distance and then have it come back to you, without any antigravity generators or built in homing devices.''
-->-- '''1001 Science Fiction Weapons'''

According to popular legend, the simple child's toy known as a yo-yo began as a weapon in the hands of Filipino tribesmen centuries ago.[[note]]Historians attribute the legend to Filipino hero Jose Rizal, who might have been really joking. He used to carve and play with yoyos while traveling on ships.[[/note]]

Whether this is true or not, if you see a yo-yo in a series with combat, particularly in an anime and particularly in the hands of a young girl, it's a safe bet that it will be slung with deadly intent and accuracy.

This legend may stem partially from the fact that as a weapon, the yo-yo bears a resemblance to the Chinese meteor-hammer, one of a set of flexible weapons in Chinese martial arts that can be employed to devastating effect and with great flair. The mundane yo-yo makes a great stand in for these types of weapons. It may also stem from the fact that a typical yo-yo user (a small child) can, and sometimes will, cause major harm to anyone in the yo-yo's vicinity, without the need of any magic or special training at all.

A type of EpicFlail. See also ImprobableWeaponUser. Compare BattleTops. Your Killer Yoyo is likely to be wielded by a BadassAdorable or a LittleMissBadass, if the writer is playing up the "deadly yet cute" aspect of this trope.


[[folder:Anime and Manga]]
* Saki Asamiya in ''Manga/SukebanDeka'' was armed with a special metal yo-yo, which became her signature weapon -- so much so that it's an integral element in the logo for the 2006 LiveActionAdaptation (now available in the United States under the title ''Yo-Yo Girl Cop'').
* Akashiya Moka flings a yo-yo at a Tengu-masked thug during their field trip to the human world in ''Manga/RosarioToVampire'' season 2. The yo-yo cracks the mask in half to reveal a face that is nearly identical.
* Princess Sparkle from ''Anime/SpiderRiders'' liturally kicked Grasshop's but with hers, several dozen times.
* Momoko "Blossom" Akatsutsumi in ''Anime/DemashitaPowerpuffGirlsZ''.
* Jun from ''Anime/ScienceNinjaTeamGatchaman''. Of course, hers ''explode'', so their effectiveness as a weapon is never in doubt.
* One of the first and most well-known examples in anime is the Choudenji Yoyo (Super Electromagnetic Yo-Yo), the signature weapon of the SuperRobot Anime/CombattlerV.
* Kiyone Makibi from ''Anime/TenchiMuyo''.
* A storyline in the ''Manga/YuGiOh'' manga (and the first series of the ''Yu-Gi-Oh'' anime) features an entire ''gang'' of yo-yo thugs, lead by one of Jounouchi's/Joey's middle school rivals. Yami Yugi is so good with it he ''brought down the roof'' of a shed!
** In the anime, one of the yo-yos even has spikes.
* Parodied in the anime series ''Anime/BakuenCampusGuardress'': one of the characters fights with a kendama.
** Genis of ''VideoGame/TalesOfSymphonia'' does this seriously. Understandably, he's a [[SquishyWizard magic-user]], but still...
*** To be fair, there's a series of skits dedicated to just how improbable it is.
* ''Manga/YuYuHakusho'' features Rinku, a child demon who uses ''psychically controlled'' yo-yos as his favored weapon. When he's first seen, he has them on each of his fingers. By the time of the Makai Tournament, he has them on ''his toes'', too.
* ''Manga/HunterXHunter'', has Killua occasionally using super-yo-yos on wires as his preferred weapon, on those occasions he uses any weapon at all -- he's shown knocking chunks out of ''trees'' with them (he's super-strong, and the things weigh ''40 kilograms each'').
* Employed by ''Anime/SuperDollLiccaChan'' in one of her forms.
* Cirucci Thunderwitch in ''Manga/{{Bleach}}'' wields a huge yoyo-like weapon in its unreleased shape.
* Mamiya in ''Manga/FistOfTheNorthStar'' uses a yo-yo that suddenly produces blades in mid-air, which makes her a competent normal human fighter, but still nowhere near as strong as martial arts practitioners.
* Chikusa Kakimoto of ''Manga/KatekyoHitmanReborn'' wields a pair of metal yo-yos that shoot poisonous needles.
* Nanaho Kinjo of ''Anime/BestStudentCouncil''.
* Carmen 99 uses a bladed yo-yo in ''Anime/GunXSword''.
* From the anime ''Toys/MachineRobo Rescue'', [[ShowWithinAShow Ninja Mama]] is a CaptainErsatz of the [=Saki/Yoko=] archetype, complete with KillerYoyo.
* The Ryuuseisui-wielding Suboshi is ''Manga/FushigiYuugi'''s resident Psycho Yoyo Boy. He doesn't use an actual yoyo, but it counts.
* ''Manga/MobileSuitCrossboneGundam'' has the Quavarze, which uses a [[LaserBlade beam saw]] mounted on the end of a "chain" of whip-like segments; again, not exactly a yoyo, but close enough.
* Sylvain Clark from ''Anime/MarginalPrince'' uses a yoyo to fight off bad guys during the last episode. He tends to fanboy over it in an earlier episode, as it is some merchandise from his [[ShowWithinAShow favourite anime]].
* [[PsychoForHire Nofix]] uses this as a weapon in ''Manga/BIchi''. His power as the King of Spin allows him to accelerate its rotation, making it all the more deadly.
* [[spoiler:Sarina]] from ''Manga/MahouShoujoSite'' has one, and in this case, the "killer" part is taken UpToEleven. To elaborate, the yoyo has an AbsurdlySharpBlade that is capable of cutting just about anything it comes in contact with; at one point, it's used to ''[[spoiler:cut a man [[HalfTheManHeUsedToBe in half]] vertically.]]'' Ouch.

[[folder:Asian Animation]]
* We have, well, ''Yo-Yo Man''.

[[folder:Comic Books]]
* Comic book example: Frank Einstein, the titular ''Comicbook/{{Madman}}'', uses a lead weighted yo-yo among other toy-based weapons.
* ''WesternAnimation/TheSimpsons'' [[ComicBook/TheSimpsons Comics]] #131 featured a manga-styled segment. Lisa appears at the end, wielding two yo-yos and sporting understandably [[Manga/DragonBall Super Saiyan]]-like hair. Pretty much a general ShoutOut to Sukeba nDeka.
* The Trickster, from ComicBook/TheFlash's RoguesGallery, has included yo-yos in his arsenal.
** While under the Top's [[{{brainwashed}} influence]], his near obsessive use of the yo-yo (commented on by one of the G-men) is probably also a tell for the normally playful James being buried under the stern, serious Agent Jesse, possibly as a bit of a slip in Top's mind screw.
* Comics example: In the Franchise/MarvelUniverse, ''Comicbook/{{Daredevil}}'' foe the Jester wields a weighted yo-yo as a weapon.
* In the Norwegian fantasy series ''Series/{{Miranda}}'', the eponymous heroine wields a so-called "coil" with great success -- it is easily hidden, and nobody expects it from such a pretty girl.
* ComicBook/TheJoker once pulled one of these in a fight and was ridiculed for using such a cliched weapon. The intended victim asked him "let me guess, it's really heavy or it explodes or shoots acid or something?" Joker proceeds to unwind the cord of the perfectly normal yo-yo and strangle the guy with it.
* Showed up in a special issue of ''ThePunisher'', where the villain wielded one and made a reference to the aforementioned Filipino arts.
* In his origin story, a young Bullseye was shown throwing a yo-yo and killing a bird with it.
* An issue tying into the ''WesternAnimation/JusticeLeague'' cartoon has Speedy playing with a yo-yo in the Watchtower; he's able to hold off the villain at one point using it.
* In ''Comicbook/{{Flashpoint}}'', the AlternateUniverse Joker's sidekick, [[ExactlyWhatItSaysOnTheTin Yo-Yo]], uses a pair of these when fighting against Batman. In [[WesternAnimation/JusticeLeagueTheFlashpointParadox the animated adaptation]], her yoyos glow yellow and pink.
* The ''ComicBook/AstroCity'' sidekick Bravo wielded bolas in combat, using them as both melee and thrown weapons.

* Film/JamesBond is attacked by a bunch of Indian mooks in ''Film/{{Octopussy}}''. One of them wields a yo-yo buzzsaw.
* While it doesn't kill, Michelangelo knocks out several hooligans with a yoyo at the beginning of ''Film/TeenageMutantNinjaTurtlesIITheSecretOfTheOoze''.
* Hansel ([[RunningGag He is so hot right now!]]) in ''Film/{{Zoolander}}'' uses a yo-yo to disarm an opponent
* Obviously, ''Yo-Yo Girl Cop'' is based on this trope.
* Egor in the ''Film/DayWatch'' movie is seen playing with a [=YoYo=] like object. It turns out to be a magical weapon. The user flings it like a [=YoYo=] but upon impact, the object shatters into hundreds of pellets that continue attacking the target, do not suffer any loss of momentum and can multiply themselves by shattering as well. Needless to say it goes out of control and eventually wipes out Moscow.
* ''Film/MasterOfTheFlyingGuillotine'' features a yoyo/hat-like device attached to a string that, as you can imagine, acts like a guillotine when it lands.
* A character is attacked with a yo-yo, among other things, in ''Film/ChildsPlay3''.
* The bladed lug wrench is upgraded to this when some rope is attached to it at the end of ''Film/SororityRow''.
* In ''Film/AvengersGrimm'', Rapunzel has turned her ridiculously long hair into a meteor hammer by braiding it and tying a steel ball to the end.

* Cadderly Bonaduce, a character in the ForgottenRealms novel series ''Literature/TheClericQuintet'', uses a halfling "spindle disk" to great effect.
** They became even more effective when he [[strike:coated them in]] filled them with oil of impact...
** Their original incarnation, before the aforementioned addition to their firepower, wasn't all that strong and effective, as they were made from rock crystal. (In fact, Cadderly was aware of that from the start -- he simply pulled an AintNoRule to have his toy classified as a 'weapon' for training purposes, being more interested in tinkering and occasionally fooling around than actual fighting at the time.) However, when [[spoiler:Ivan makes him a new pair out of Adamantite, even he admits that they're a good weapon (while having to remove a piece of someone's face before giving them to Cadderly).]]
* The ''Literature/TheBaroqueCycle'' by Creator/NealStephenson claims the Filipinos had ''bladed'' yo-yos, and gives one to the enigmatic Enoch Root.
* The Creator/MarvelComics novel ''Time's Arrow: The Present'' has Taskmaster attempting to decapitate Jean Grey with a yo-yo that has a monofilament string and an automatic circuit to ensure it constricts. He also takes the time to give a brief lecture on their use in the Philippines.
* A brief passage in the final book of ''Literature/TheDemonata'' describes a small girl using a yo-yo to fight off demons. No, really.
* Subverted in the first ''Literature/AlexRider'' book: one of Alex's "gadgets" is a modified yo-yo. He expects it to be weaponised somehow, but instead it has [[GrapplingHookPistol an extendable and extremely strong cord.]]
* In ''Elven Star'', the second book of ''Literature/TheDeathGateCycle'', a character uses a weapon called a "raztar" that appears to be a yo-yo with extendable razor blades.

[[folder:Live Action TV]]
* In ''Series/KamenRiderRyuki'', Kamen Rider Verde wields a yo-yo.
* ''Series/PowerRangersDinoThunder'' has Conner and his Battlizer armor, the main weapon of which is the Dragon Yo-Yo. A killer yo-yo made of fire. Silly, but it works.
* One of the entries in the Creator/{{Syfy}} channel's ''Series/{{Face Off}}'' makeup-F/X game show, submitted for a challenge to design an original horror movie character, used a yo-yo as a lethal weapon.
* The mooks who is known by the alias as "Yo Yo" in ''Series/{{Healer}}'' has a yo-yo that has a rather sharp string, though it only comes into play when its wrapped around something like an arm and pulled. It has the benefit of being something counted as a toy even if it is only about as effective as you'd expect a weighted yo-yo to be and he prefers a gun when he can get away with it.

[[folder:Tabletop Games]]
* [[http://rpg.drivethrustuff.com/product/17889/1001-Science-Fiction-Weapons-%28Revised%29?it=1 1001 Science Fiction Weapons]] has a chapter on combat yo-yos. There is a complaint it's uncommon outside anime.
* An article in ''Pyramid'' magazine had a 'Delinquent Schoolgirl Cop' archetype (an obvious homage to ''Sukeban Deka'') for the ''TabletopGame/FengShui'' role-playing game. One of the weapon choices available for the character was the combat yoyo.

[[folder:Video Games]]
* Bridget from ''VideoGame/GuiltyGear XX'' wields a standard yo-yo as a weapon; this is likely part of the joke, as it goes nicely with the nun habit, in-line skates and teddy bear.
** And giant handcuff belt-hula hoop thing.
*** Which according to one of his win animations, also doubles as a yo-yo holster.
*** (Yes. [[UnsettlingGenderReveal His]]. Likely part of the same joke, at least via culture context).
* In ''VideoGame/TheAdventuresOfWillyBeamish'', a yo-yo is the weapon you finally beat the BigBad with. Since you begin the game with it and only get to use it at the end, if also serves as a ChekhovsGun.
* Mike Jones' primary weapon in ''VideoGame/StarTropics'' is a yo-yo. You upgrade the weapon as the game progresses.
** There's also a bola weapon.
* "Yoyo Yoko" Koshibojin from the fighting game ''VideoGame/{{Ehrgeiz}}'' uses one in most of her attacks; hence the nickname.
* In ''VideoGame/TheGoonies II'', Mikey's primary weapon is a yo-yo, which isn't found in the movie to which the game is an unofficial sequel.
* One of the ranged weapons in ''VideoGame/EarthBound'' is a yo-yo. It's practically useless, but ''all'' ranged weapons (except Jeff's best ones) suck in this game. Strangely enough, in his appearances in the ''VideoGame/SuperSmashBros'' series, his yo-yo attacks are much more useful: in the first game, they do massive damage, and in ''Melee'', can be used in a Ness-only glitch to make him virtually-untouchable.
** Justified, as Ness uses his PSI to manipulate the force and motion of the yo-yo (and his other weaponry).
* ''VideoGame/{{Mother 3}}'' has the "Friend's Yoyo" as an optional weapon. It's actually quite powerful, raises speed, and can be given to any of the party members except for Boney. And then on Tanetane Island, you can buy a Spiky Weapon, which is basically a yo-yo, [[RecycledInSpace with spikes.]]
* In ''VideoGame/KirbySuperStar'' and ''VideoGame/KirbyStarAllies'', one of VideoGame/{{Kirby}}'s exclusive copy abilities is Yo-Yo, taken from the Gim enemy. It consists of [[DanceBattler breakdancing]] with a yo-yo ([[ShoutOut and a backward]] [[VideoGame/EarthBound baseball cap]]).
* One of the weapon sets available to Acrobats in ''VideoGame/FlyFF'' is a yo-yo.
* Yo-Yo is a chip starting from ''VideoGame/MegaManBattleNetwork 2''. It deploys spinning blades from the disk as it's fired 3 panels ahead and deals double damage to any enemy in its way and triple damage to the enemy on the third panel and stuns the enemy instead of making them flinch allowing Mega Man to attack again. They also count as sword chips, making them useful against the Shadow viruses.
** The Spinning Blade from ''[[VideoGame/MegaManX Mega Man X3]]'' becomes this when charged.
* Malin from ''VideoGame/TheKingOfFighters''.
* Megumi Taktsuki from ''Rumble! @ the Campus''.
** One of the prototypes show Kiyo wielding one.
* A massive, bladed yo-yo called a "Diskarmer" is the signature weapon of the ''VideoGame/{{Rygar}}'' series.
* In Creator/DataEast's arcade FightingGame ''Hippodrome'', the FinalBoss is a giant taking up half the screen wielding a Killer Yo-Yo of Doom simply called "[[TheUnpronounceable !@#$%!@!]]".
* Captain Blue Jr. from ''VideoGame/ViewtifulJoe.''
* The ancient terrifying Disney game ''VideoGame/NightmareNed''.
* In ''VideoGame/{{Superfrog}}'', the titular character fights enemies with a yo-yo, but sadly, it has use only against flying enemies.
* In the SNES game ''[[VideoGame/GanbareGoemon Legend of the Mystical Ninja]],'' the best weapon is the bladed "Yokohama Yo Yo." This yo-yo is not seen in any other ''Ganbare Goemon'' games, though the chain pipe serves a similar purpose as a long-range weapon.
* Enough yo-yo weapons were implemented in ''VideoGame/KingdomOfLoathing'' to make its own weapon type. Examples range from the yo (a primitive yo-yo which does half damage) to the yohohoyo, a multi-elemental weapon wielded by the wacky pirate.
* The ''VideoGame/ToyStory'' game fills Sid's room with spiked yo-yos hanging from the ceiling.
* Rita from ''VideoGame/TalesOfVesperia'' gets a yoyo as a weapon.
* In the ''Franchise/SuperMarioBros'' games, the term "Hammer Bro" originally referred to an elite group of [[{{Mook}} Koopa Troopas]] that specialized in throwing [[DropTheHammer hammers]], but their ranks have since expanded to include Troopas with other weapon specialties. One such specialty, seen in ''VideoGame/MarioAndLuigiSuperstarSaga'', is the yo-yo, wielded by a species called "Yo Bro".
* ''VideoGame/GotchaForce'''s Spinner Girl uses a spiked yo-yo.
* The "Yo-yo of Death" from ''{{Website/Neopets}}'' is a powerful battledome item. How powerful? It's sold in the '''Hidden Tower'''.
* In ''VideoGame/SuperRobotWars,'' the R-2 wields a [[LaserBlade Beam]] Chakram attached to a cable. The Huckebein Mk II also has an exploding one as a weapon.
* Mid-90s third-person fighter/shooter ''VideoGame/TimeCommando'' had a weaponized yoyo in the 'future' levels.
* The washed up superhero ''VideoGame/CaptainRainbow'' duel wields yo-yos. [[http://www.youtube.com/watch?v=I-RuY5twLgY No, really]].
* One of [[VideoGame/RogueGalaxy Jupis Tooki McGanel's]] special attacks is Yo-Yo Shock, where he swings an electrified yo-yo in a circular arc to damage all enemies.
* One of the weapons in the game adaptation of ''WesternAnimation/TaleSpin'' was a yo-yo.
* ''VideoGame/SamuraiWarriors 3'' - Hanbei Takenaka wields a giant bladed yo-yo that he also uses as a one-man ''helicopter''.
** Similarly, [[PluckyGirl Bao Sanniang]] from ''VideoGame/DynastyWarriors 7''.
* In ''Videogame/SengokuBasara'', Sarutobi Sasuke uses two of these as his weapons. Kasuga and Kotaro originally used these due to being character clones, but were later given weapons of their own.
* A much more serious-looking variant occurs in the ''Franchise/{{Castlevania}}'' series, where multiple titles feature animated suits of armor that wield large spinning spiked discs, usually known as "disc armor" or "discus armor".
* Another discus-style weapon wielder is Bunny from ''VideoGame/BunnyMustDie''.
* Candi Roll from ''VideoGame/KungFuChaos'' wields twin yoyos.
* ''VideoGame/{{Spinmaster}}'' had yo-yos as the player characters' main weapon.
* The Yobobot in ''VideoGame/{{Shatterhand}}'' flings a large white ball around itself.
* One of the two styles of melee weapon available to Dawn in ''VideoGame/{{Lemegeton}}'', the "rotary knife" (actually more like a meteor hammer with blades attached), has yo-yo-like animations during some of its attacks.
* ''Frak!'' for the UsefulNotes/BBCMicro starred a caveman armed with a yo-yo.
* Domino's Pizza's commercials had a character called the Pizza Noid, who had a couple of his own video games. In one of them he was the protagonist and his primary weapon was a yo-yo.
* Yo-yo Man's weapon in ''VideoGame/MegaManUnlimited'', the Yo-yo Cutter. When obtained by Mega Man, it fires out a yo-yo that can be aimed and can also move along the floor and walls before returning to him.
* Gustav, the third boss of ''VideoGame/{{Einhander}}'' has spinning disks connected by a chain on each shoulder that he can send out. They act like deadly razor yo-yos.
* ''VideoGame/{{Terraria}}'' introduces yo-yos as a melee weapon type. They can be thrown out to attack, follow the mouse for a set period of time, then retract. They do continuous damage as long as they make contact with an enemy. They can be difficult to master, but the fact that they follow the mouse allows the player to attack from behind cover. They also have accessories that can increase their length, create a counterweight, and even send out a second yo-yo.
* Meru's primary weapons in ''VideoGame/SuperHeroineChronicle'' include yo-yos.
* One of [[RobotBuddy Browny's]] weapons in ''VideoGame/ContraHardCorps'' is the "Super Electromagnetic Yo-yo". It's surprisingly powerful and one of the best weapons in the game, dealing heavy continuous damage on contact with enemies as well as homing in on them.

[[folder:Web Comics]]
* ''Webcomic/{{MAGISA}}'' -- [[http://mag-isa.thecomicseries.com/comics/pl/119773 Alice]] uses a weapon like this.
* ''Webcomic/{{Bug|Martini}}'', while doesn't weaponize it, explores the [[http://www.bugcomic.com/comics/yo-yo-injuries-common/ injury]] [[http://www.bugcomic.com/comics/yo-yo-injuries-uncommon/ potential]] of yo-yo.
* In ''Webcomic/CommanderKitty'', [[http://www.commanderkitty.com/2010/08/08/rewind/ Fluffy disarms Zenith with a yo-yo.]]

[[folder:Western Animation]]
* ''WesternAnimation/BatmanTheAnimatedSeries'':
** The Joker has used one at least twice.
** In [[Recap/BatmanTheAnimatedSeriesE25TheClockKing "The Clock King"]], the eponymous villain use a pocket watch as this against Batman.
* Toyman utterly owns Killer Frost with one of these in the penultimate episode of ''[[WesternAnimation/JusticeLeague Justice League Unlimited]]''.
--> [[BondOneLiner Awww...sleeper.]]
* Velma's yo-yo in ''WesternAnimation/APupNamedScoobyDoo''. Although it's not a killer, it's extremely helpful, as she used it to hold on trees, tangle villains, gain speed in their Mystery Skate...
* ''WesternAnimation/TheBoy'' typically used special Yo-yos.
* In an episode of ''WesternAnimation/JackieChanAdventures'', a mobster uses a yo-yo to hit the button that will lower Jackie and Tohru into a shark tank. Moments later, Jackie uses the same yo-yo to entangle the mobster's feet, preventing his escape.
* Wadi wields one in ''WesternAnimation/TheSecretSaturdays''.
* In ''WesternAnimation/GadgetBoyAndHeather'', Gadget Boy uses a yo-yo to tie up the villains in the show's opening.
* In one episode of ''WesternAnimation/HeyArnold'', Arnold's yo-yo proves fatal to Eugene's goldfish when it breaks from its string, falls into the goldfish bowl, and knocks over the toy knight, killing the fish.
* The Smurflings used yo-yos against Gargamel in ''WesternAnimation/TheSmurfs'' episode "Have You Smurfed Your Pet Today?"
* The primary weapon of Señor Yo-Yo in ''WesternAnimation/SheZow''.
* ''[[http://www.hasbrostudios.com/shows/page/title/blazing-team Blazing Team]]'' is an entire series built on this.
* The main weapon of Ladybug in ''WesternAnimation/MiraculousLadybug''. She mainly uses it for [[Franchise/SpiderMan Spidey]]-style {{Building Swing}}ing. The string is [[VariableLengthChain as long as she wills it to be]], she can SpinToDeflectStuff with it, the whole thing is indestructible by mundane means, ''and'' she use it as a video phone. It's [[AWizardDidIt explicitly the product of the magical artifact that provides her powers]].
* In ''WesternAnimation/StevenUniverse'', [[spoiler:Smoky Quartz, Steven and Amethyst's fusion]], combines their weapons into a large yo-yo, and uses it to ''[[CurbStompBattle trounce]]'' Jasper.
* ''WesternAnimation/SwatKats'': Madkat uses a giant saw bladed yo-yo in the episode "Enter the Madkat."

[[folder:Real Life]]
* As mentioned in the article quote, the yo-yo is rumoured to be a traditional Filipino weapon primarily used as an anti-snake device in farm fields. The theory holds some water considering that a Filipino man, Pedro Flores, was the first in introducing the yo-yo in the West. However, there is a Greek vase representing a boy playing with a yo-yo, so it's pretty sure that the object was at least known in other cultures as well.
* The [[http://en.wikipedia.org/wiki/Boleadoras boleadoras]] used in the Argentinian pampas.
* While not identical in style to a yo-yo, a type of weapon known as the [[http://en.wikipedia.org/wiki/Slungshot Slungshot]] works in a remarkably similar manner.
* The [[http://en.wikipedia.org/wiki/Chinese_yo-yo Chinese yo-yo,]] while not an actual weapon, can be spun to dangerous speeds that can result in the loss of teeth or eye(s) if the wielder loses control of it.
* A standard Western yo-yo, as noted above, is the bane of babysitters and parents everywhere. Those fancy trick yo-yos that were briefly fashionable around the turn of the millennium are even worse. And ones made of aluminum, especially the ones with weighted inserts, are even more dangerous. Anyone just starting to learn tricks would be wise to use a mouthguard and mind their hands/wrists when throwing/returning the yoyo with any significant amount of force.