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- The ur-example might be the 1970s Ginsu knife commercial that showed someone using a Ginsu to cut through an aluminum can. Even comedians of the time wondered why.
- Later Ginsu commercials showed the blade cutting through an orange juice can - a CARDBOARD orange juice can.
- When making the commercials, the staff tried cutting anything they had on hand, and if it worked they'd put it in the ad. This included a radiator hose, which was actually installed on an employee's car when they tested it. It's a wonder they didn't go for battery cables and electrocute themselves.
- The Miracle Blade 3 infomercial shows a guy wielding a knife like a sword to cut right through a pineapple that's hanging by a thread from the ceiling. It's supposed to make the user think the blade is as sharp as a sword - it must be to cut through that tough, spiny pineapple rind, right? But pineapples are actually quite easy to cut through, especially just below the crown.
- Host "Chef Tony" Notaro also cuts up a strip of paper in the same infomercial. Cutting through paper is actually the bare minimum of whether or not a knife is sharp enough to be used for normal knife things.
- The original Oxiclean ads showed Billy Mays removing orange-brown dye from a large bowl of water. While it's undeniably impressive, very few people need to clear dye from water on a regular basis.
- Additionally, the main reason it's difficult to remove an old coffee stain from a button-down shirt is because the stain has been set into the fabric over time. With a bowl of water, there's nothing for the dye to "set into"; it just suspends, and while it might be impossible to take it out with your hands, a chemical should do just fine.
- The dye used in the water was likely some sort of Iodine solution, which has a very specific chemical reaction to sodium which turns the iodine colorless. This trick only works on a very specific chemical. Really this ought to be obvious - of course the dye cannot by made to disappear, so the only explanation is a chemical reaction. Cleaning clothes involves dissolving dirt and stains and washing them away, which is completely different to turning a solution colorless.
- Vacuum commercials and demonstrations work on this principle. Yes, the suction in a Dyson or an Oreck is strong enough to suspend a bowling ball, but what does that mean for your home? Not much, it turns out: without a decent beater bar to dislodge the dirt from carpeting and high-quality, thick brushes to sweep the dirt off hard floors, a vacuum with strong suction is little better than a vacuum with no suction at all (and even worse in some instances - strong suction can actually damage some surfaces).
- Not only that, but the pressure produced when the nozzle is completely blocked by a bowling ball does not necessarily have anything to do with the air flow rate when the nozzle is against a surface being vacuumed (which is what actually matters for cleaning).
- There was an infomercial back in the 90s for an iron cover which apparently was supposed to prevent users from scorching their clothing because they were too stupid to set the iron's thermostat correctly. (It worked by insulating the face of the iron, which meant you were basically setting your iron to High and ironing on Low.) One of the demonstrations showed the presenter meticulously ironing a thick wool casual sweater. Certainly wool does iron beautifully with very little effort and looks wonderful on camera, but who in the history of humankind has ever ironed a thick wool casual sweater?
- A related gimmick is, as an example, using a dirtier floor or a darker stain on a lighter shirt for your product, and only cleaning the middle. Because the contrast between cleaned and uncleaned is greater, the product seems more effective.
- Every insurance company likes to point out that people who switch to their company save hundreds of dollars. Impressive, until you realize that people who won't save money don't switch and are excluded from the calculation. Also an example of lying using statistics.
- Insurance rates also tend to drop as you get older, but most insurance companies won't recalculate your rate in the middle of a policy, and will try to keep charging the same when you renew a policy for as long as they can. This leads to people "saving" money not because the service is actually cheaper, but because their rates are being calculated using current information.
- Twenty or so years ago, Crest showed commercials where half an egg had been treated with their toothpaste, then the whole thing submerged in an acid solution. The treated side remained hard while the untreated shell became soft and malleable. What they didn't tell you is that virtually any fluoridated toothpaste would give you the same result.
- This is why toothpaste is usually the go-to example of a parity product — i.e., one in which all competing brands are equally effective and largely interchangeable. In order to sell different brands, marketers have to resort to inventive (if mildly unethical) tricks like the egg-in-acid wheeze.
- Every commercial advertising a pillow will show someone testing it by dropping a bowling ball, dumbbell or other heavy weight on it to show how supportive it is, often with a nice fragile egg under it to make a big messy result. But, unless you're a metalhead, you're not going to be slamming your head into the pillow at that high of a velocity.
- In the Edge of Glory ad, Anthony Sullivan uses the product to sharpen a credit card into a blade, which he then uses to cut up a tomato. Who knows why the company thought anyone would be impressed with their product's ability to cut plastic.
- In the Brazilian Juicer Walita ad, the host shows the product's sturdiness by using it to get raw cassava juice. Raw cassava is much harder than any kind of fruit (it's supposed to be boiled - and it takes quite a while to boil it to the right point - and then either fried or used in soups), but the funny part is that raw cassava is actually toxic. So, on the course of the ad, there was a huge yellow disclaimer explaining that while it can make cassava juice, you are not supposed to drink it.
- In one commercial for Bridgestone Tires, they coated a bowling ball in the roll-surface of their tires, allowing it to be rolled down the lane in a perfect line for a strike. Actually, the main difficulty in aiming a bowling ball is the fact that it's heavy, has a polished or just very smooth surface, and that the floor you'll be rolling it on is also heavily polished and oiled, and therefore slippery. Coating a bowling ball in ANY rubber, whether it be from these tires, that of their main competitors, or even from a pencil eraser will give it much more traction and give you similar "perfect" results.
- In fact, it's the oil that's the key to the curve of a bowling ball: The slippery oil prevents it from curving until it gets to the dry part of the lane, where the ball then grips the lane and curves. The reason bowling balls aren't made of rubber is that they're more elastic (read: bouncy) than the current standard (plastic or polyurethane), thus actually harder to get a consistent curve, even on a smooth surface.
- Bathroom cleaners and the like often do a demonstration where a dirty coin is left half dipped in the product and comes out looking shiny and new looking. This becomes a lot less impressive when one talks to an actual numismatist (coin collector) - or someone with a knowledge of basic chemistry. They'll be able to tell you that plenty of stain producers (such as ketchup, toothpaste, or—as the MythBusters showed—ordinary cola) will do an equally good job of removing coin tarnish. In a slightly incidental note, those aforementioned coin collectors will reject coins that have undergone cleaning with chemicals outright, since the process can remove thin layers of metal from the coin as well as the natural patina, and therefore reduces their value significantly.
- Nicely averted by the Macho Monster 7000 waste treatment shredder, more commonly known as the machine that destroys EVERYTHING. You'll notice that most stuff going into the shredder is mostly "soft" garbage like shoes and tampons, with the "strongest" stuff being a trio of paint cans or an old rotting crate palette. This is because the machine's selling point isn't how much damage it can do, but how resistant it is to jams.
- The Fridge Locker ad brags about how even an 800 pound bear can't break their product (basically a lockable lunchbox). Throughout the demonstration, said bear does little more than curiously poke the fridge locker.
- Similar to the various kitchen cutlery products above, this also occurs in the bladed replica and reproduction market. Some sellers will attempt to up-sell "wall-hangers" (cheaper, dull or fairly dull blades, with the only purpose being to be hung on a wall plaque or table stand) by demonstrating how they can cut things like their business card (or just scratch off a layer from it), fruit or vegetables, implying they're usable. And here's a video helpfully showing why attempting to use such replicas outside their intended purpose for whatever reason, is a bad idea.
- In one Encyclopedia Brown story, High School Hustler Wilford Wiggins tries to sell a device he claims can controls birds, and demonstrates this by having a rooster crow at sunset, as opposed to sunrise. Encyclopedia ruins the scam by pointing out that since the rooster was kept in a bag before hand, the bird probably thought it was sunrise and Wilford's so-called invention did nothing.
Live Action Television
- Deadliest Warrior often makes use of these demonstrations for entertainment value when testing various weapons. Hand weapons are often swung at targets that are braced for impact so that the full force of the weapon is transfered to the target. Fragile targets are also used for weapons that don't supply very much force. This ensures that each weapon cleaves or pulverizes its target to impressive effect.
- Most people use a blender for three things: to blend liquids with ice, making milkshakes, and to puree vegetables or fruit. In the Will It Blend? series, Blendtec's friendly nerd blends iPhones, laser pointers, video cameras, golf balls, and the like. But they all blend easily because they're relatively high-density solids that pulverize into powder when blended. Most food doesn't act like that. When Mark Bittman attempted to use a Blendtec to puree chickpeas in a New York Times video, the viscous mass of peas was too thick to circulate properly and a bubble of air formed around the blades - not surprisingly, because all blenders do the same damn thing. To process thicker, denser foods, a food processor is your best bet.
- In fact, the Blendtec spins so absurdly fast even on the lowest settings that it's ideal for blender drinks and frappes (which is why so many coffee shops use BlendTecs), but anything thicker will form an air bubble almost instantly. Luckily, they do make a special jar now for handling extremely thick subtances.
- Parodied in this knife commercial: "If you want to cut through a tennis ball, for some reason, you can do that too."
- Houdini frequented this. Tricks seem more impressive if the audience only thinks they're difficult, for example in escaping from being locked in a safe. Ask yourself: are safes designed to keep people in, or out?
- American Standard markets toilets that are powerful enough to flush several golf balls without clogging. Unless you poo like an elephant, or radically overuse toilet paper, you don't need this much flushing power. Then again, how else can they demonstrate a toilet without it becoming a huge case of Squick? Other than use Toilet Humor, of course.
- Occasionally, this is inverted (as in, the people making the claims are working against the product) by viral videos, social media posts, urban legends, etc. that attempt to show how harmful soft drinks and junk foods are by doing something other than actually consuming them. For instance, one e-mail used a list of alternative uses for Coca-Cola to argue that it's unsafe to drink.
- Energy drinks are the occasional subject of a moral panic, as allegedly they cause heart attacks, fainting, seizures and plenty other nasty things, which people attribute to some mysterious chemical ingredient. In practice, most of them are sugary soft drinks laced with vitamins, caffeine and taurine. About the same caffeine percent as a strong coffee. Keyword is sugary, as they come in 250ml or 500ml cans and in hot summer months people may be tempted to consume them like any other soft drink, all at once. It's like saying someone got drunk from "a pint of alcohol" - it's not the same thing if a pint of pure alcohol comes from 10 beers drunk over many hours, or an entire bottle of malt whiskey in one sitting.
- Low mileage vehicles. While mileage can be a factor in an used vehicle's condition, a better guidance while buying a car is the state in which it currently is. For example, a 50k mile car which spent all its life on badly-kept road and received literally no maintenance would be in a worse condition than a meticoulusly cared of vehicle driven only on smooth suburban roads for 300k miles.