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- The Ring Scam is one of the traditional good-for-bad cons. The con man offers to sell the mark a diamond ring for a few hundred dollars. The con man allows the mark to take it to a jeweller and get it examined — at which point the jeweller assesses the ring at much more than the asking price; it's a real ring worth thousands. The Mark's greed is turned against him, encouraging him to run outside and agree to the deal. The con man will use some pretext to get his hands on the ring, and switch it for a glass lookalike worth about five dollars, selling the worthless duplicate for his original asking price. An early version of this scam involving a gold-plated brass ring is known as "fawney rig".
- This scam is thought to be the root of the word "phony" for "fake". The root comes from the Irish word "faínne", which means "ring".
Films — Animation
- Peewit in The Smurfs and the Magic Flute tries and fails to swap out one of the magic flutes for a fake.
Films — Live-Action
- Ocean's Twelve intended to do this to the Coronation Egg-swap out the real egg for a hologram-before a rival thief, Francois Toulour, beat them to it and won a bet. The twist was they already switched the real egg for a fake one while the real one was transported by a nondescript courier.
- Played with in the threequel Ocean's Thirteen, where Linus and his father swapped out Willy Bank's Five Diamond awards for fakes, only for Toulour to steal them from him. He actually stole the fakes. Linus actually was there to plant bombs around the case the diamonds were in to steal the entire case, diamonds and all.
- In Catch Me If You Can, Frank Abagnale overpays a high-class prostitute with a phony cashier's check and receives his change in cash, effectively tricking a gorgeous hooker into paying him $400 for a night of testing the hotel's bedsprings.
- Frank avoids getting the Jerk Ass tag for this because the hooker was not up-front with him about what she was. He thought he had simply found an attractive woman willing to take a romp with him. It wasn't until they were about to... seal the deal that she started negotiating a very steep price for her services. Once Frank caught on that he was effectively being conned himself, he took the opportunity to turn the tables on her.
- According to Frank Abagnale's book (which was the basis for the movie), this incident ultimately cost him big-time as the hooker gave the FBI a description of him, something they didn't have before then.
- This is used in the Discworld novel Going Postal, in which conman Moist von Lipwig views a real ring and a fake ring as part of his basic tools for emergencies. When the man wants to have it valued and they go to an actual jeweler he shows the man a real diamond ring. Reassured that it's real the mark then buys the ring, and when he takes it back to the jeweler to sell he's informed that it's brass and glass.
- His backup plan, if he can't source the real ring, is to walk through the motions of this con... and then make the trade almost immediately thereafter, without any time for a switch, with the aim of proving to the mark that this relatively well-known con isn't going on. The trick here is that Moist bribed the jeweler ahead of time to testify that his glass ring was real.
- Happens to Bertie Wooster in the short story "Pearls Mean Tears". Fortunately Jeeves isn't as easy to dupe.
- In Investment Biker, Jim Rogers remembers how in developing countries he would change money with black-market street vendors (who would give him fake notes maybe one time out of twenty) rather than official banks (who would take ten or twenty percent as commission on every transaction.)
- An old woman goes into a poultry shop and asks for a duck (the last one in the shop). The shopkeep presents it to her, but she says it's a bit scrawny, so he takes it in the back, hooks it to a bicycle pump and puffs it up a little. He triumphantly returns, only for the old lady to change her mind and decide she'll take both of them.
- Truth in Television with any "traditional medicine" that used the parts of endangered species. For example, powdered rhino horn is considered an aphrodisiac. Not only is the claim bullshit, but they almost always use substitutes like cow bone for the actual powder. They always SHOW you the horn, but not the grinding process. And, unfortunately, this fact doesn't stop the poaching of actual rhinos for their horns.
- Used as part of the "bait and switch" scheme. Bait-and-switch involves a business luring customers in notice of a good or service; upon arrival, the advertised good or service is not available but instead the customers get offered one that is more expensive and/or is of poorer quality.