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- Lupin III has done this two different ways:
- This one is "50 Ways to Leave Your 50-Foot Lover", a Lupin III (Red Jacket) episode. Fujiko's singing attracts the Loch Ness monster. Later on, when Lupin goes out onto the Loch, a Nessie-shaped submarine draws him in. The reason the sub was built? To catch the real Nessie - the scientist who built it has an Ahab complex towards the Loch Ness monster, and wants to use Fujiko to attract it so he can capture it.
- In Lupin III: Alcatraz Connection, the movie opens with a luxury gambling ship under attack by a sea monster that looks like Nessie! (It's an inflatable head Lupin is using to distract everyone while he steals all the money from the vault.)
- Played with in Dinosaur King. It's not a submarine, it's an Amargasaur. As per the trope, the real Nessie shows up at the end.
- The Private Life of Sherlock Holmes is probably the defining version of this trope. In this film, the Great Detective's brother, Mycroft, is directing top-secret development of Britain's first submarine in Loch Ness; an attached prop monster head keeps the local gentry fooled into thinking it's the beastie.
- The Strange Monster of Strawberry Cove from The Magical World Of Disney TV show involves an Expy of Loch Ness and Nessie; when a teacher thinks he saw the local monster and is ridiculed as a result, three of his kid students try to help his case by building a fake monster. Ultimately, it turns out that what the teacher had seen was actually smuggler's boat.
- And an inversion of this trope is found in the film The Water Horse. Nessie — or Crusoe, as she's called here — gets shelled by the British Army. Well, they thought she was a submarine!
- Also played straight, to a degree. Two old men keep trying to get a picture of Crusoe, but fail every time. So they fake it by putting a boat upside down in the water to produce the famous picture of the neck sticking out of the water. Interestingly, as they're faking it, the real one was right on the other side of a tree, in good view if they could've seen it.
- In a maritime variant, two prank-playing boys in Jaws use a cardboard fin to scare everyone out of the water just before the real shark shows up.
- One short story featuring The Saint had the detective investigating a murder supposedly caused by the monster. Turns out it was just a hoax to cover up the real murderer... who ends up killed by the real Nessie in the end!
- In Jules Verne's 20,000 Leagues Under the Sea, many early accounts of the Nautilus's attacks speculated that it was a giant narwhal. Certainly the Ur-Example of this trope in fiction, as nobody was writing about submarines before Verne.
- Yobgorble: Mystery Monster of Lake Ontario by Daniel Pinkwater features a Nazi U-boat shaped like a giant pink pig, so that any Allied naval personnel who saw it would just assume it was a barnyard animal out for a swim and ignore the threat. It ends up trapped in Lake Ontario and mistaken for a Nessie-style lake monster.
Live Action Television
- The Voyage to the Bottom of the Sea episode "Secret of the Loch". The Seaview not only finds a navigable underwater passage into the Loch, but a Soviet — ah, I mean, Enemy— submarine there, pretending to be the monster. And based on what the model work was like, doing a rather bad job of it. Some may feel quite cheated to find out Nessie was a submarine in this one and, on considering how often "Voyage" had REAL sea monsters on the show, then feel REALLY cheated.
- Stingray (1964), a TV series that had actual sea monsters in it, sent Troy Tempest and his crew to Loch Ness, where they found Nessie was a robot, built in the 1940s and put through its paces to again, encourage tourist travel to the loch.
- The X-Files episode "Quagmire" has Mulder and Scully investigating reports of a lake monster. In one scene the owner of the local tourist trap is shown faking some monster footprints, whereupon he gets eaten by the real monster, a large alligator. Of course, this being the X-Files, we see at the end there really is a giant serpent in the lake.
- The Goodies follows the basic outline, but the monster is only shown to be fake long after it's captured, when a zookeeper talks about breeding it with another captured sea monster. A real Nessie also hatches from an egg after the zookeeper tried to kill himself in shame.
- Done on Sea Hunt, naturally enough, although it was only supposed to be a generic "sea serpent," and not Nessie herself.
- This example takes place in Minnesota rather than Scotland, but on an episode of Little House on the Prairie the children of Walnut Grove fabricate an Expy of Nessie to frighten Mrs. Oleson into leaving an old woman's lakeside house alone after the former tried to take it from the latter.
- In the Doctor Who serial 'Terror of the Zygons', the Fourth Doctor and his current companions arrive in Scotland and trace an alien signal to Loch Ness, where strange things have been happening recently. Don't worry, it's not Nessie... it's just a giant plesiosaur-shaped cyborg that provides food for the Zygons. Much more sensible.
- On Murdoch Mysteries, an apparent monster in Lake Ontario turns out to be a rope-and-winch-controlled apparatus rigged up by a solitary beach-dweller, who'd wanted to scare bathers away from "his" beach because he hates how crowded it's become.
- Alley Oop is about a time traveling cave man named Alley Oop. A few years ago, Alley's pet dinosaur Dinny tagged along for one adventure, and the pair wound up in medieval Scotland. Suffice it that the Scots have remembered Dinny's visit ever since.
- Alley made a second (unintentional) visit to Scotland while bringing back two young plesiosaurs to the present; the two youngsters escape into the nearest lake, which just happens to be...
- Phoenix Wright: Ace Attorney uses this one in the fourth case of the first game, with a creature named "Gourdy" being spotted in Gourd Lake. The monster's "head" that was captured on a photo was actually an inflatable Steel Samurai being blown along by the air tank that some idiot (Read: Larry Butz) was using to inflate it.
- Played straight, then subverted in Mega Man Star Force 2. Geo goes to a foreign country where there is a legend of a monster called Messie. it is a submarine, but the director making money off of a 'Search of Messie' show runs into Hyde, who offers him a sea monster EM partner, Plesio, which he uses to become Plesio Surf.
- In Tomb Raider III: The Lost Artifact, Lara can get up close and personal with a robotic Nessie which breathes fire. While Nessie can also be seen elsewhere - on the surface of the loch, in the distance - it's not clear whether they're one and the same.
- Scooby-Doo! and the Loch Ness Monster gives us three Nessies: a robotic submarine version, a less sophisticated (but still somehow totally convincing in appearance) "parade float" version, and the real monster. The real one looks very different than the impostors, namely having flippers and a tail fluke.
- Gargoyles had an identical plot to the Lupin III episode listed above.
- The Monster Lake episode of Inspector Gadget had a robotic Loch Ness monster.
- Done on Denver the Last Dinosaur, though in that case it was a guy trying to make money rather than keep people away.
- An episode of The Magic School Bus had an inflatable lake monster, planted by an unscrupulous journalist who wanted to become famous by getting the "scoop" on the monster.
- In an episode of The Simpsons, Mr. Burns drains Loch Ness to find the monster, but it turns out it's just the Loch Ness High School float - which is then stomped on by the real Loch Ness monster.
- The Gobblewonker from Gravity Falls turns out to be a robot controlled by local kook Old Man McGucket. Once again, there turns out to be a real Gobblewonker.
- The LOL Irock episode "Legend of Lake Agnes" is an interesting case where the heroines themselves have to perform a "Scooby-Doo" Hoax on the civilians they're boating with to cover up the actual monster the villains have sent to attack them, ultimately convincing them that the lake monster "Aggie" is benevolent when "she" helps them out. Despite having to do this, Iris says in her narration that she still believes that not everything on Earth has been discovered. Naturally, we cut back to Lake Agnes...
- In one of the 1960s Popeye shorts, Olive is a newspaper reporter sent to Scotland to photograph the Loch Ness monster. Popeye goes along "just for laughs", and shows her that the monster is mechanical.
- Zoo education director John Shields once pranked some Nessie-hunting colleagues by planting the doctored carcass of an elephant seal, recently expired of natural causes at Flamingo Park Zoo, floating offshore in Loch Ness.
- Comedian Bill Hicks once mused that the Loch Ness Monster was a submarine, driven by Bigfoot.
- The Royal Navy tested and trained with its ultra-secret midget submarines in Scottish lochs, including Ness. The reasoning was that any sightings could be mistaken for loch monsters, which would only help to confuse and obscure what was really going on there.