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[[quoteright:222:[[WesternAnimation/{{Futurama}} https://static.tvtropes.org/pmwiki/pub/images/bender_coin_string.jpg]]]]

Characters inserting a tied coin into a coin-operated device and then pulling the coin out with the string to steal an item or service from the machine. However, this trope also extends toward other things.

Later in the 1980s, when video game arcade operators realized that people were doing this, [[TropeBreaker manufacturers started putting a string cutter into the coin mechanism]]. If you tugged back to try to hit the switch again, the string would cross the cutter and be severed by it, thus capturing the coin and preventing its reuse by the crooked customer. In modern times, coin-operated machines simply have a one-way ratchet, preventing the return of any coin once it has passed the counting mechanism.

A similar trick existed with banknotes and vending machines: attaching sellotape to the note, feeding it into the machine, then pulling it back out. Again, as with the coin string trick, this will not work on any machine built since the early 90s.

Not to be confused with HeadsTailsEdge, when a coin ''flip'' is tied, or HypnoPendulum, which is another use for a coin on a string. Compare CashLure.

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!!Examples:
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[[folder:Comic Books]]
* ''ComicBook/DisneyDucksComicUniverse'': One Creator/CarlBarks story features Donald Duck going to a valley to test echoes. His nephews set up a box where one can deposit a dime and expect an echo in exchange. The nephews just repeated whatever Donald said every time he put a dime in the box. It turns out that Donald was using the trick to get free echoes. They retaliate and eventually get the seven dimes.
* ''ComicBook/KidPaddle'' tries this trick along with a variation: small discs of ice of the same diameter as a coin.
[[/folder]]

[[folder:Comic Strips]]
* One ''ComicStrip/{{Garfield}}'' strip made use of this trick with a cookie, instead of a coin.
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[[folder:Films — Animation]]
* ''WesternAnimation/RobinHood1973'': The Sheriff of Nottingham pulls a variation on this when Robin is disguised as a blind beggar: flipping a coin into Robin's cup with so much force that it bounces itself and the two coins already in the cup out, where he snatches them in mid-air.
* ''Animation/TreasureOfSwampCastle'': The guard is a victim of this trope used as bribery. Though it's done without string, two characters invoke this.
[[/folder]]

[[folder:Films — Live-Action]]
* In ''Film/RealGenius'', Creator/ValKilmer's character uses liquid nitrogen to freeze water into rods the diameter of a quarter, then slices off slugs with a cutting tool to feed the vending machine.
* In the 1920 movie ''Film/TheScarecrow'', Buster Keaton tricks the gas meter with a dime on a string.
* ''Film/{{Yellowbeard}}'': Commander Clement wants to get some information out of Harvey "Blind" Pew but doesn't want to pay for it. Each time he drops a coin into Pew's cup, he yanks it back out again with a string.
[[/folder]]

[[folder:Literature]]
* The Panello Brothers in ''Film/GoWest1940'' manage to con Quale out of $9 by giving him a $10 bill on a string when they buy a $1 hat off him. They even repeat the gag when he tries selling them a poorly-made jacket.
* In ''The Black Spider-Knight Leopold XVII'', to take a chance at slaying a dragon[[note]]actually an enormous sentient truck[[/note]], the eponymous knight needs to go through an automatic toll booth first, and the fee is a pocket of gold coins. Jamming a sword in the money slot doesn't help because it has apparently been built to withstand this kind of abuse from this setting's knights, so Leopold tries this trick. The string is immediately cut by built-in automatic scissors.
* ''Literature/{{Discworld}}'': Recruits to the Ankh-Morpork City Watch were once given a coin, the King's Shilling, and sworn in on it when they gave their oath of service. In modern times, however, the Watch has become so [[OddlySmallOrganization stingy and under-financed]] that (even though a shilling is no longer quite so much money[[note]]explained once by the shilling being a real gold coin worth considerably more than its nominal value[[/note]]) the officers have a shilling on a string to perform the tradition on the cheap. At one point, Vimes (masquerading as a transfer officer from another city) twits an officer by grabbing the coin before he can pull it back.
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[[folder:Live-Action TV]]
* ''Series/HaltAndCatchFire'': Cameron uses a trick quarter on a string to play a ''VideoGame/{{Centipede}}'' machine for over an hour. She gets kicked out of the bar when patrons complain about her hogging the machine and the manager discovers Cameron's trick quarter.
* ''Series/RedDwarf'': Rimmer tries this once, only to discover that the [[VengefulVendingMachine (sentient) vending machine]] is keen to this trick and equipped with an alarm. And a taste for LaserGuidedKarma.
* In the ''Series/ShiningTimeStation'' episode, "A Dog's Life", Schemer uses this trick to try to find out where his nickels end up when someone puts them in the jukebox since he can never get any out of it. When he tries to pull it back out, Tito Swing holds onto it. When Tito lets go of the nickel at the request of the other members of the Jukebox Band, he causes Schemer to fall over.
* ''Series/TheSuiteLifeOfZackAndCody'' episode "Rumors" opens with a revelation that Zack has been using this trick:
-->'''Moseby:''' I have it from a reliable source that a little boy who was about your height and your hair color was seen in the game room tampering with the games and playing for free.\\
'''Cody:''' Well, it wasn't me!\\
'''Zack:''' You know, Mr. Moseby, you can't believe every rumor you hear.\\
'''Moseby:''' OK, I know it was one of you two, and since I don't know which one, the game room is off limits to the both of you! ''(leaves)'' Hmm. It's good to be the manager.\\
'''Cody:''' This stinks! Now I can't go in there, and I've been saving up my quarters.\\
'''Zack:''' You know, Cody, you wouldn't have to save up your quarters if you just used mine. ''(pulls a coin-on-a-string out of his pocket)''\\
'''Cody:''' So it was you.\\
'''Zack:''' Well, duh! It wasn't you! Boy, smart people are dumb.
[[/folder]]

[[folder:Video Games]]
%% * The ''Escape the Phone Booth'' flash game.
* ''VisualNovel/TheGreatAceAttorney'': Of a sort. [[spoiler: In order to get free gas, Shamsphere used a threepenny coin to create an indentation on several bars of soap, filled them with some kind of liquid (usually water, but Soseki's tea on the night of his poisoning due to the water pipes being frozen), and left them outside in the cold weather to create fake ice-coins, and then paid the gas machine with those, with the hole he made at the bottom of the coinbox ensuring that when the coins melted, they would leak out and cover up their use.]]
* In ''VideoGame/{{Zork}}: The Undiscovered Underground'', the protagonist has to use this trick to get the information they need out of a coin-operated CreatorCameo. ItOnlyWorksOnce, though.
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[[folder:Webcomics]]
* Muse of ''Webcomic/HelloWanderingStar'' is shown doing this in one strip. She isn't particularly "heroic".
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[[folder:Web Original]]
* ''Website/SCPFoundation'': Some of the experiments done on [[http://www.scp-wiki.net/scp-261 SCP-261]] (a seemingly ordinary snack vending machine that dispenses random snack-type items ranging from mundane to bizarre) used a coin on a string. Unfortunately, that always turned it into a VengefulVendingMachine: At first it responded by dispensing seemingly normal food items that caused the eater to promptly vomit them up, and eventually ended by simply dispensing a live grenade. The Foundation stopped testing the coin-on-a-string trick after that one.
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[[folder:Western Animation]]
* ''WesternAnimation/DastardlyAndMuttleyInTheirFlyingMachines'': In "Operation: Anvil," Dastardly relieves Muttley of his medal after he botches an operation to catch Yankee Doodle Pigeon. Muttley had a string tied to the medal, so as Dastardly walks off, Muttley yanks the medal back.
* ''WesternAnimation/DonaldDuck'':
** His early films has him using this technique (a la Mr. Krabs) to economize at a fair.
** In ''WesternAnimation/ModernInventions'', he uses this technique to enter the Museum of Modern Marvels for free. In the climax of the short, he attempts this technique again to get a free haircut from a robotic barber chair but ends up getting a humiliating makeover.
** In "Donald's Happy Birthday", when Donald forces his nephews to put their allowance in a bank, one of the nephews tries to do this to keep his coin, but Donald was one step ahead of him and cuts the string with scissors.
* ''WesternAnimation/TheFairlyOddParents'' episode "The Big Problem" features this in an ImagineSpot Timmy has where he is an adult. One scene depicted in the sequence is his babysitter Vicky living on the streets now that he's too old to need her looking after him. Adult Timmy appears to put a coin into Vicky's begging cup, but then yanks the coin away by the string it's tied to and yells "Psyche!"
* Bender from ''WesternAnimation/{{Futurama}}'' is fond of the coin-on-a-string trick.
** [[EstablishingCharacterMoment The first time he uses it]] is in a suicide booth. ([[RuleOfFunny What is he saving the coin for then?]])
** In "The Duh-Vinci Code" he tries it with a giant coin. It tears his arm off.
** He does it again in "Lethal Inspection" when using a phone booth, in a similar manner to the pilot episode.
* The ''WesternAnimation/GoofTroop'' episode "Maximum Insecurity" had Leech use the coin-on-a-string trick to snag a free soda from a vending machine. PJ then runs into him and gets him mad by breaking the string and making him lose the coin it was tied to.
* [[WesternAnimation/LooneyTunes Looney Tunes and Merrie Melodies]]:
** In the 1939 WesternAnimation/PorkyPig cartoon "The Film Fan", one of the newsreels shows a skinflint attempting to cheat a claw machine with this trick, only for the claw to grab him and shake him down.
** "WesternAnimation/ChowHound": A greedy bulldog, who had been bullying a cat and mouse to help him in his insatiable quest for all the meat (and gravy) in the world, uses a form of this – a "cat on a string," if you will – as the payoff of his scheme. Having held them hostage for weeks, the owners post "lost animal" ads in the newspaper, and when the dog collects the rewards (returning him in a trick bed), he yanks the cat away by yanking it by a string tied around his tail and sneaking away before the owners notice their cat is missing.
** In "The Mouse that Jack Built", the mouse played by Creator/JackBenny goes down to the cheese vault (counterpart to the money vault in the radio shows). He opens the first door by putting a coin on a string into a box, then pulling it up again. Since Jack Benny often played a cheapskate in his radio shows, this might have been to keep in character.
* Done in the 1937 short ''Magic on Broadway''. This was part of Paramount/Fleischer Novelty-Cartoon shorts which featured animation in part of it and live-action in the other half. The cartoon half of this entry has a slot-machine player cheating the machines in a penny-arcade by tying a string to the coin and pulling it out again. The machines get rather animated about being cheated and the petty-gambler receives some rough treatment.
* ''WesternAnimation/TheProudFamily'': Oscar Proud is cheap enough to do this to a ''[[KickTheDog sidewalk charity collector]]'' during a Christmas special. Penny isn't impressed.
* A flashback on ''WesternAnimation/TheSimpsons'' implies this helped Mr. Burns make his fortune.
* ''WesternAnimation/SpongeBobSquarePants'':
** In the episode "Krusty Krab Training Video", archival footage shows a young Mr. Krabs using the coin-on-a-string trick method on a vending machine.
** In the later episode "Kracked Krabs", Krabs and the other crabs do this when tipping the bell boys at the hotel.
* ''WesternAnimation/TopCat'' does the coin on a string trick during the opening credits; snatching the coin back from a doorman after he has tipped him.
* ''WesternAnimation/WhateverHappenedToRobotJones'':
** The episode "Vacation" shows Robot's friend Cubey use the coin-on-a-string trick while at Nob's Arkaid.
** In "Hookie 101", Mitch uses the coin-on-a-string trick as a solution for when the gang are at the arcade after being tricked out of most of their money and using the remainder to help out a monster living in an ice machine.
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