There are three or more identical bags. One bag contains jewels or top secret documents, other bags contain other items of a random nature (and in wildly variable values) and one bag ALWAYS contains underwear.

Through a series of random accidents and deliberate thefts the bags get switched. Repeatedly. The remainder of the story is a form of a farce based on people trying to get the "right" bag. The bags will change hands many times through many different players, and always on camera so that the audience can actually try to play the ShellGame and keep track. Unfortunately, they never actually open the bags to check that the contents are correct until they find themselves in utterly humiliating circumstances. Except for the person with the jewels: chances are they're the unlucky one who lost their underwear. Chances are once they see the jewels they won't really care too much anymore.

The funny pretty much requires at least three bags. If there are only two then the players who are trying to get the bags will easily be able to hunt down the only other bag. But with three or more bags things just get insane.

A common joke in a ScrewballComedy.

There's also a variant where the wrong lunch was grabbed - apparently, in television shows, kids always pack their lunch in a plain brown bag instead of an easily-identified character on a reusable box or bag. Note that in this case three bags are not needed. The humor can come from the child getting raw giblets for lunch instead of their peanut butter and jelly.

Compare SwitchedAtBirth, ShellGame. See also StolenMacGuffinReveal. When ''one'' character gets two or more objects mixed up, that's UnfortunateItemSwap.

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!!Examples:

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[[folder:Comic Books]]
* {{Tintin}} was once framed for drug-running this way. The bad guy stole his real suitcase and replaced it with an identical one full of heroin.
** In ''The Broken Ear'', he was framed by switching his suitcase for one containing {{Cartoon Bomb}}s.
* Over the decades, ''ComicStrip/SpyVsSpy'' has gone through just about every conceivable variation on this trope, often with the decoy satchel having a bomb in it.
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[[folder:Film]]
* [[http://www.imdb.com/title/tt0103827/ Blame It on the Bellboy]] is entirely based on this, with a hitman, a guy considering a real estate purchase, and a big schmuck there for a Medi-Date, each given the wrong envelope at a hotel in Venice. This results in the hitman thinking that he has to kill [[spoiler:a woman there for a Medi-Date,]] the real estate buyer ringing the doorbell of [[spoiler:some violent mobsters,]] and the schmuck expecting a [[spoiler:sexy real estate agent]] to sleep with him.
* In ''WhatsUpDoc'', there were four cases, having government papers, jewels, rocks for a scientific presentation, and underwear.
* In the movie ''Film/ElMariachi'', the bad guys have the titular character mistaken for a hitman with a guitar case full of weapons who is trying to kill their drug lord leader, a situation that is only exacerbated when at one point, the two cases end up switched and the mariachi and the hitman end up with each other's stuff.
* The fantastic movie ''Film/EightHeadsInADuffelbag'' [[ExactlyWhatItSaysOnTheTin embodies this trope.]]
* The movie ''Film/{{Push}}'' does this in a rather unusual way by adding in a bit of precognitive sleight of hand on top of multiple cases.
* ''[[HomeAlone Home Alone 3]]'' starts with two identical shopping bags in an airport. One contains a toy car with a microchip stolen from the Army hidden inside it. The other contains French bread.
* The ultimate conflict in ''PoliceAcademy 5'' comes about because a group of criminals who have smuggled diamonds into the country have placed the package in which the diamonds are concealed in a bag which is externally identical to Commandant Lassard's luggage, who is taking the same flight as the criminals. They end up claiming the wrong bags when they get to Miami, forcing the villains to try to track down Lassard and reclaim the diamonds.
* Sylvester Stallone's mobster farce ''Theatre/{{Oscar}}'' contains a textbook example: 3 black satchels containing cash, jewels, and the former maid's unmentionables. It ultimately saves him when the police show up to arrest him. Toomey concludes that Snaps is using the bankers to launder money, and has his men look for the black bag as proof (not knowing there's more than one.) Fortunately for Snaps, Nora (the owner of the underthings) comes in and takes the more visible bag of jewels, leaving the bag of underwear for the police. Toomey then opens the bag, thinking it's the final nail in Snaps' coffin, and dumps its contents on the table, right in front of the reporters.
* The Creator/JackieChan film ''Legend Of Drunken Master'' starts with one of these. One package holds a stolen cultural artifact, the other holds a ginseng root that Jackie's master purchased on a shopping trip. The packages get swapped by accident when Jackie tries to smuggle the ginseng past customs.
* Averted in ''Film/FightClub'': while the two suitcases are identical, the reason why is something entirely different...
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[[folder:Literature]]
* Used in the very first ''Literature/FatherBrown'' story with a package containing a valuable cross. [[spoiler:Twice]].
* A series of books based on ''TabletopGame/{{Clue}}'' have all of the guests arrive at Mr. Boddy's mansion with identical-looking suitcases. Some contain valuables, and others contain valueless personal items. Given the characters involved, it should be no surprise that the ones who own the cheap items attempt to swap suitcases with the other guests, resulting in one character attempting to steal valuables but winding up with mouthwash.
* One LordPeterWimsey story has a bag of jewellery accidentally swapped for an identical-looking bag containing an actress's severed head.
* In James Blaylock's ''Homunculus'', four of Keeble's mechanical boxes are eagerly sought by the heroes and by several different villains. In this case, ''all'' of them have value to ''somebody'', but characters in search of a particular box's contents (an emerald, an oxygen-maker, a perpetual-motion device, and the title creature) keep snatching the wrong one.
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[[folder:Live Action TV]]
* Done with sausages in ''Series/AlloAllo'' - at one time they had a sausage with a stolen painting, a sausage with a fake painting, a sausage with dynamite for LaResistance and an ordinary sausage for Herr Flick's dinner.
* Used in a more serious vein in ''{{Hustle}}''. The grifters often swap out the case full of money at the last second, save for a few episodes where the switch does not go as it should and they lose a lot of money, giving them an incentive to take on a riskier con to make up the cash.
** In one amusing episode, they switch out the other party's case only to realize that the other party had done the exact same thing to them as the two sets of grifters had been [[LetsYouAndHimFight set up to go against]] each other.
* ''Series/FawltyTowers'': Basil has to pick up a roast duck from Andre's restaurant in order to salvage his gourmet night. Unfortunately right next to the duck somebody sets down a trifle with an identical cover.
* An episode of ''Series/WillAndGrace'' used the brown paper bag variation of this: the contents being exchanged included Jack's soup, [[LadyDrunk Karen's]] booze, Rosario's floor polish and Will's sperm sample.
* An episode of ''TheBurnsAndAllenShow'' entitled "A Paris Creation" invokes the trope with two briefcases with the initials "G.B": one belonging to George, the other a nuclear scientist.
* A non-comedic example in the ''Series/{{Nikita}}'' episode "The Next Seduction." [[spoiler:Nikita swaps the suitcase containing a dirty bomb with one containing clothes in order to get it out of the hands of Gogol and Division.]]
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[[folder: Newspaper Comics]]
* In a classic ''ComicStrip/TheFarSide'' strip, two scientists have identical unmarked beakers. One of them loudly objects to the replacement of his dysentery culture with lemonade just as [[IDrankWhat the other takes a drink]].
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[[folder:Radio]]
* ''Radio/AdventuresInOdyssey'': It's two identical laptop computers in their identical cases -- one being Whit's, the other being a top secret government computer full of military secrets stolen by Dr. Blackgaard -- that get switched in a hotel shuttle van while Whit and Connie are in Chicago for a conference.
* In ''TheGoonShow'' episode "Foiled by President Fred" the payoff involves a red sack and a blue sack. Which sack contains the real money and which contains forged notes? Eccles claims to know, but he's colour-blind. Or ''is'' he?
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[[folder:Role Playing Games]]
* One D20Modern adventure features no fewer than four characters with identical (gaudy and "unusual") bags, each with vitally important and for the most part incriminating contents. Compounding matters are two additional characters who plan to intentionally switch their own (again, identical) bags with someone else's. The GameMaster is instructed to treat the adventure as a corporate espionage thriller, so that the players will be surprised when [[HilarityEnsues Hilarity Inevitably Ensues]].
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[[folder:Theatre]]
* In ''Theatre/{{Oscar}}'', there were three cases, having jewelry, cash, and lingerie. Angelo keeps thinking he's finally got the one with something valuable (money or jewels), only circumstances have given him the one with women's underthings... again. And because nearly all comedy protagonists choose the route most designed to embarrass them, he never bothers to check what's inside before dumping it out on the table in front of guests.
* ''TheImportanceOfBeingEarnest'' "A handbag?"
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[[folder:Video Games]]
* One of the revelations of TheRashomon in ''NeedForSpeed: Carbon'' is the switching of two bags, one of them with money.
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[[folder:Western Animation]]
* ''HeyArnold'': Arnold, Gerald, and Sid find a shopping bag full of money, and decide to take it to the police station in the morning to collect a reward. But when Arnold arrives with the bag, it's full of birdseed. He tries to explain, "There was this old woman next to me on the bus, and she had pink hair, a peg leg, and one eyebrow. She had a whole bunch of shopping bags just like mine, and she must have taken my bag by mistake." [[CassandraTruth Nobody believes him]].
* ''TheFlintstones'' episodes had this when Wilma's mother arrives at the Flintstone house carrying the same bag as the old bank robber lady had while she was staying there. The robber leaves to evade the police, taking the wrong bag, while Wilma's mother opened the bag containing stolen money and got arrested by mistake.
* In one episode of ''WesternAnimation/TinyToonAdventures'' there is a murderer on the loose who happens to look just like Hamton, at one point Plucky tricks Hamton is crawling into a sack which he then ties shut and tries to take him to the police, along the way he bumps into some bank employees who are transporting money and he grabs a sack of money by mistake, and when he presents the bag to the police and finding it full of money he promptly arrested.
* An odd example in ''WesternAnimation/MyLittlePonyFriendshipIsMagic''; Twilight and friends are waiting to greet the games inspector, who they're told has a floral print suitcase. The pony they wind up with is an unnamed claustrophobic tourist with mustang blood. HilarityEnsues.
* In ''WesternAnimation/TheSmurfs'' ChristmasEpisode "The Magic Sack Of Mr. Nicholas", Gargamel captures a bunch of smurfs while Chlorhydris steals Mr. Nicholas's toys. They bump into each other, swapping bags in the process.
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