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- Invoked in Neon Genesis Evangelion with the Jet Alone demonstration. Gendo is worried the competing mecha will be a problem for NERV so he has Ritsuko sabotage the demonstration. Having a combat vehicle go out of control and nearly suffer a nuclear melt down in a populated city was enough to get it scrapped.
- In the original Amazing Spider-Man, Dr. Octavius has problems during his new invention's demonstration, which sets him on the path to become supervillain Doctor Octopus. The movie Spider-Man 2 carried over this element of his origin-story.
- Played with in the Mega Man comic. Blues' power failure during the test fight convinces the military to simply scale back the nature of the combat robots they want to order from Dr. Light instead of cancelling it outright.
- A common event in Dilbert. For example, when Dilbert demonstrates his team's 3-D holographic interface for the new VP, the Dark Angel of Product Demos shows up inside the monitor (alongside Wally who's pretending to be the interface), tells the VP the product is a fake, and shows her some dirty photos the male engineers have been storing on the server.
Films — Animated
- In Cars 2, the Lemons exploit this trope, actively conspiring to discredit green fuels by engineering terrible wrecks during a worldwide racing demonstration by vehicles using the Allinol biofuel.
- In Meet the Robinsons, Bowler Hat Guy tries to pass Lewis' invention as his own to a corporate board. As he doesn't know the first thing about how to operate it, the meeting is a complete debacle.
- This also happened to Lewis with his earlier prototypes, as seen in the page image.
- Many of Flint's demonstrated inventions in Cloudy with a Chance of Meatballs, even the main plot is a case of one Gone Horribly Right.
Films — Live-Action
- In Rise of the Planet of the Apes, Bright Eyes escapes and rampages through the biotech company's facility, until she's shot right in front of its board of directors. The serum that made her intelligent is immediately shelved, even though her escape was a result of handlers' errors and her own Mama Bear nature, not the serum.
- RoboCop franchise:
- In RoboCop (1987), the demonstration of a glitching ED-209 results in one of the company's lesser executives becoming Ludicrous Gibs. (Maybe using live ammo in a demonstration was a bad idea here). The ED design is sent back to the drawing board in favor of Robocop.
- In RoboCop 2, the Robocop Mk. 2 prototypes end up committing suicide within seconds of being unveiled. The first one also shot several technicians, which is why they didn't give the second one a gun. Also, Robocop Mk. 2 goes berserk in front of a large press corp when OCP holds an event to promote its new police-cyborg.
- Averted in RoboCop (2014). At first it looks like it'll be played straight — Murphy suffers a Heroic B.S.O.D. while downloading the police database, including CCTV footage of the car-bombing that maimed him. Ordered to get him on his feet immediately for Robocop's first press conference, Dr Norton tampers with Murphy's neurochemistry to completely repress his emotions. Murphy stomps past his family and ignores the Mayor's outstretched hand, scanning them and everyone else in the crowd for potential threats. Fortunately he sees one - a man wanted for murder - and leaps into the crowd and tasers him. The event is then spun as an example of Robocop's amazing abilities in comparison to regular law enforcement, who failed to notice a wanted man in their midst.
- In Splice, the transgenic organisms Fred and Ginger tear each other apart during a live TV promotion for their creators' gene-splicing technology. The program that created them is cancelled because of the debacle.
- Young Frankenstein: Freddy introduces his monster in a song-and-dance routine, which goes fine until a stage light bursts into flame, which scares the monster into going on a rampage.
- Something always goes wrong when introducing Kong to the general public.
- Charlie Chaplin's like this trope:
- Modern Times has a gag in which a salesman pitches a mechanical feeding device (to save time on lunch breaks) by testing it on the Tramp.
- In The Great Dictator the inventions by Adenoid Hynkel's scientists fail on demonstration. Played for laughs, but not without a jod of Mood Dissonance.
- In Honey We Shrunk Ourselves, Wayne's less-than-impressive presentation is implied to have lost a major deal, with the investors leaving looking dissatisfied.
- In Young Einstein, Preston Preston steals Einstein's beer-bubble-maker and, in his ignorance, nearly nukes London in his attempt to demonstrate it.
- In Deal Of The Century, when a UAV is launched at a military aircraft demonstration, it malfunctions and destroys the expo. The design is justifiably scrapped when these technical difficulties are found to have resulted from the drone not being water-resistant.
- Invoked in Iron Man 2, when the villain deliberately waits until the new military drones are being displayed at a massive product-premiere event before usurping control of them and siccing them on Iron Man. Tony also plays footage at the Senate hearing of this trope afflicting North Korea's, Iran's, and Hammer's attempts to build power armor.
- Hal's defeat of the drone planes in Green Lantern came close to this, but Carol's fast-talking subverted her company's loss of its contract.
- Played for Laughs in J-Men Forever. Admiral Ballsy demonstrates the dangerous effects of rock & roll music to the FCC (Federal Culture Control). The sound waves destroy a flask of milk being used as the target, then the window behind it, then an entire skyscraper.
- In Scanners, the famous exploding-head scene takes place at what was supposed to be ConSec's official debut of its scanner program before representatives of other intelligence agencies.
- In X-Men: Days of Future Past, Magneto hijacks the Sentinel prototypes at their public debut to provide a high-profile platform for his attack and New Era Speech.
- In Joy, the man hired to demonstrate the mop Joy invented live on a shopping channel obviously didn't bother to touch the thing before stepping in front of the cameras and trying to sell it. Needless to say, the demonstration went poorly.
- Those Fantastic Flying Fools (aka Jules Verne's Rocket to the Moon). Professor Von Bulow's wacky inventions include a Prussian Helmet Cannon that nearly kills the Kaiser, and a bridge that collapses during the Ribbon-Cutting Ceremony.
- Subverted in the New Jedi Order series. Lando Calrissian founds a company to build high-quality battle droids to act as Elite Mooks against the Yuuzhan Vong invaders. They end the demonstration and the prototype promptly opens fire on the crowd ... revealing the Yuuzhan Vong infiltrators spying on the event. The droid did exactly what it was supposed to.
- Zigzagged when Lando reveals that, of course, with the head of state and a half-dozen influential generals in the next hovercar over, the droid isn't carrying heavy ordnance and has a power regulator on its blasters (meaning it can't shoot much more than a laser pointer). When this reduced arsenal understandably fails to stop the infiltrators, YVH 1-1A demonstrates a further feature, its flexible heuristic combat routines. Translation: it bear-hugs them to death.
- One episode of Honey, I Shrunk the Kids's TV spinoff featured an alternative-energy car (powered primarily by burping) that Szelinksi felt might revolutionize the industry ... however a traveler from the future warned them that something had gone wrong during its planned production, resulting in a Bad Future, and they had to find a way to stop it. It was ultimately the foul-smelling exhaust that turned investors off.
- In a blackout sketch on The Benny Hill Show he plays a TV pitchman selling a new cleaning product; he tosses some liquid (juice?) on the wall and a man in a labcoat uses the product to clean up - except the product doesn't clean off the stain, it cleans the wall's decorative paint off while leaving the stain.
- In The IT Crowd, Moss's prototype bra that he is trying to get investors for production has a bad habit of spontaneous combustion.
- Used on Dark Matters: Twisted But True, to dramatize setbacks in Truth in Television research, e.g. dentist Horace Wells' pioneering use of nitrous oxide for anesthesia.
- When investigators on CSI Crime Scene Investigation visit an industrial shredding operation, the foreman explains that the piece of equipment they're shredding at the moment was a prototype that broke down during a promotional demo.
- On Hogan's Heroes, the prisoners invoked this trope when they arranged for a remote-control prototype tank to destroy an officer's car and then explode. In another episode, they sabotaged a prototype noiseless aircraft engine so that it made a hellacious racket.
- Monty Python's Flying Circus - in the second half of the Architect Sketch, Eric's presentation model for a high-rise block of flats lists over, partially collapses, then actually explodes and catches fire...but thanks to his Freemason connections, the planning board approves it. (Note: this sketch was done soon after a newly-built state-of-the-art highrise in London actually did catastrophically fall apart - hence the flashing caption "SATIRE" over this sketch.)
- In the shopping channel task of Series 3 of The Apprentice (UK), the cliché shown below under 'other' really happened — Kristina tried to sell a floor cleaner, but because it wasn't plugged in it only spread the dirt around. And that wasn't the most cringeworthy demonstration in that episode, either.
- The Muppet Labs sketches from The Muppet Show run on this trope. Perhaps the most notable example is in the Gilda Radner episode, where Dr. Honeydew's new super glue is spilled all over the theater, causing problems throughout the remainder of the show.
- When Don Knotts guest-starred, he appeared in a skit as a scientist unveiling a newly discovered creature. He talks about how the cage the creature is in is escape-proof, only for it to slip through the bars immediately afterwards. As it runs amok in the lab, Knotts assures the audience that the creature is harmless, which is the creature's cue to attack him. And then the creature's mother shows up...
- Several such mishaps occur in Stargate SG-1. A prototype energy weapon was canned after firing it once shut down the entire primary power system for Stargate Command. Played with in another occasion: they're demonstrating a new kind of body armor that should be resistant to the staff weapon blasts used by the Goa'uld. They demonstrate this by shooting Syler with a staff weapon. The blast knocks him off his feet and sets him on fire, which seems very bad... but it's then pointed out (after he's hurriedly extinguished) that other than slightly winded and a bit singed, Syler is just fine, whereas a staff blast at that range would otherwise have been lethal.
- BattleTech has many, most of which are in the Experimental Technical Readout: Boondoggles - a collection of Flawed Prototypes. The LIB-4T Liberator had a torso design that made it incapable of dealing with its hot engine, leading to the battlemech's torso violently exploding during a live-fire demonstration when the heat caused its ammo to cook-off; the design was then canned and the prototype was later used as target practice (ironically by a descendant of the tank that it was using as target practice). The Bright Star jumpship was built to explore systems autonomously with no crew. Come demonstration day, the ship goes along its assigned 10 planned jumps before going off the rails, jumping from system to system for decades or possibly even centuries.
- One optional mission in Starcraft II Wings Of Liberty begins with a public demonstration of the Dominion's new super-high-tech Humongous Mecha, the Odin, which unbeknownst to the crowd has been hijacked by Raynor's Raiders. Emperor Mengsk's prerecorded speeches about how his scientists and engineers have created "the ultimate response to the zerg threat" play periodically as a counterpoint to the Odin stomping over parked cars and blowing apart military bases.
- Superman: The Animated Series
- In the pilot, the "Lexo-Skel Suit 5000" is stolen by Kaznian mercenaries during its demonstration. Turns out, however, that this disaster was planned by Lex Luthor to get the military to buy even more powerful and expensive versions from him since there wasn't anything wrong with the machine itself.
- In a later episode this is played somewhat more straight, with an anti-missile weapon called the Sky Sentry failing to activate during its unveiling. After Lex had ordered two actual missiles fired at the building it was unveiled at. Ultimately it's revealed that Brainiac had sabotaged the machine to lure Lex to him.
- In the episode "Critters" of Batman: The Animated Series (Well, technically The New Batman Adventures), Farmer Brown's demonstration of giant farm animals goes awry when the giant sheep he's presenting breaks out of its cage. The idea behind the giant animals was to create a means to end world hunger, but because of the incident Farmer Brown was ordered to stop his work. Which of course led to him becoming the villain of the episode.
- Almost every Sumdac Systems prototype in Transformers Animated, from the pilot episode onwards.
- The classic cliche is the door-to-door vacuum cleaner salesman, who starts by dumping dirt (or worse) on someone's carpet to demonstrate the amazing cleaning power of his vacuum, only for something to go terribly wrong.
- A man fell to his death from his law firm's high-rise office building while attempting to show off the sturdiness of the glass windows by ramming into them. In a way, he was right, for it wasn't the glass that broke - the window popped out of its frame. This story won a Darwin Award.
- The original launch of the Advanced Passenger Train in the winter of 1981 was a publicity disaster from which the project never recovered.
- One of the reasons why "bat bombs" — real bats rigged with minute explosive charges — were never deployed in WWII was because the wrong ones were released during a demonstration, and carried their live explosives into the rafters of the building where their military potential was being studied. Ka-boom.
- Australian politician Joh Bjelke-Petersen's farce with the so-called hydrogen car.
- When the Columbia Mark IX, a prototype automobile with the Entz Magnetic Transmission, was taken out on its test run, the transmission threw out a spark which hit the gas tank. The resulting fire destroyed the car.
- In a Real Life version of the ED 209 incident in RoboCop (1987), during a demonstration, the DIVAD automatic anti-aircraft gun aimed its guns at the VIP's attending. Thankfully, the only injuries were the ones the brass got while scrambling for cover.
- Windows 98 infamously crashed during its 1998 COMDEX Unveiling, showing the consumers the first of many Blue Screens Of Death to come. Rather than being cancelled, however, this didn't even so much as slow its release.
- A tool-assisted Speedrun of Gradius, running on an actual Nintendo Entertainment System, desynced at the 2014 Awesome Games Done Quick.
- The Vasa, built at enormous expense by the Swedish Navy in the 1600s, and at the time one of the largest ships ever built, sank immediately upon launching in full view of assembled royalty and nobility.