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''Piranha 3D'' is a remake (InNameOnly, really) [[Film/{{Piranha}} of the original]] Creator/JoeDante B-movie, directed by Creator/AlexandreAja.

Set at Lake Victoria, a minor earthquake opens up a chasm that connects the lake to a larger subterranean one. The local sheriff (Elizabeth Shue) escorts a trio of scientists to explore the underwater cave, while her chief deputy (Ving Rhames) is left to oversee the chaos of Spring Break. However, thousands of prehistoric piranha that have outlived their species' extinction by millions of years are now able to escape to the surface, eating two of the scientists, and then making their way towards the town's very active beach.

Also filling out the adult cast are Creator/JerryOConnell (a Girls Gone Wild-esque producer/director), Creator/ChristopherLloyd (a marine biologist), and [[TheCameo Richard Dreyfuss]] ([[DeathByCameo a local fisherman who is the first to get eaten]]). As incredible as it may seem, the film actually got mostly ''positive'' reviews, for being realistically scary, but also knowing when to indulge in its BMovie roots. Two years later, a sequel was released, ''Film/Piranha3DD''.

!!This film provides examples of:

* ActionMom: The sheriff. [[MamaBear She shows no hesitation to go help her kids when they're in danger.]]
* ArtisticLicensePhysics: Mr. Goodman's explanation for how the piranhas could have lived in isolation under the lake for millions of years with no other food: cannibalism. The piranhas would use much more energy than they could consume from eating their own.
%%* AttackOfTheKillerWhatever
%%* AttackOfTheTownFestival: Actually spring break, but close enough.
%%* BittersweetEnding
%%* BMovie
* BlackComedy: The deaths are sometimes over-the-top hilarious, but still remain horrifying. [[spoiler: The death of Novak at the end definitely fits this.]]
* BleachedUnderpants: Actual porn star Riley Steele plays a side character, who is also a porn star.
* BloodierAndGorier: Ramps this up to ridiculous levels, and it's obviously intentional.
* BloodyHilarious: Some of the deaths, such as the DiagonalCut scene and the girl who, while being carried to shore by two guys, turns out to be more injured than they thought, as the one holding her legs [[MadeOfPlasticine accidentally rips]] the bottom half of her torso off.
* CassandraTruth: The police warn the partygoers to get out of the water, but nobody listens until the blood starts spilling.
* CelebritySurvivor: Porn stars and a sleazy Joe Francis clone are among the {{red shirt}}s.
%%* ChekhovsGun: [[spoiler: The propane tanks.]]
* ConspicuousCG: Joe Dante's advice to Alexandra Aja, the director of the 2010 version, was "even if you're doing the fish in CGI, use puppets". It's very easy to tell which piranha is CG and which fish is a physical prop.
* {{Corpsing}}: When [[spoiler: Derrick's]] half-eaten body is brought onto the boat, Laura's actress can be seen grinning instead of looking horrified.
* CruelAndUnusualDeath: Lots and lots of this, including non-piranha caused deaths: a girl gets sliced in half by a high tension wire and watches her bikini top fall off before [[DiagonalCut the rest of her upper torso follows suit]]. Another girl's hair gets tangled in the propellers of a speedboat, ripping off her scalp and face. The host of a Wet T-shirt contest is decapitated. In more piranha-related news, a piranha eats a woman from the inside out, emerging from her mouth. Two piranhas fight over the severed [[spoiler:penis]] of a pornographer...and didn't like it in the end.
%%* DamselInDistress: Kelly.
%%* DeadStarWalking: [[spoiler: [[TheCameo Richard Dreyfuss.]]]]
* DeathBySex: Promiscuous spring-breakers, a pornographer, and wet t-shirt contest host ([[DeathByCameo played by]] Creator/EliRoth) are on the receiving end of the piranhas' teeth.
* DiabolusExMachina: Although the ending wasn't really candy and rainbows, it was revealed that [[spoiler: the piranhas throughout the movie were actually babies, and a man-sized adult piranha eats one of the main characters]].
%%* DistractedByTheSexy
* FamousLastWords: Derrick saying to Jake "Wet t-shirt. Wet t-shirt." for no apparent reason.
* {{Fanservice}}: First half of the film is filled with lots, particularly the underwater nude ballet between Kelly Brooke and Riley Steele (who, by the way, is an ''actual porn star'').
* FanDisservice: Then cue the piranha attacks. Many very beautiful people (in bathing suits) are killed in ways that combine sex and gory violence. For example, the girl who gets sliced in half by a high-tension wire as mentioned earlier: first the bikini top falls off, exposing her breasts... then the rest of her upper torso follows suit. Also Jerry O'Connell's severed penis, which is even more horrific if you saw it in theaters in 3D.
* FictionalCounterpart: The plot revolves around a Wild Wild Girls production/event, an obvious parody of Girls Gone Wild.
%%* FlyingSeafoodSpecial
%%* {{Gorn}}
* GroinAttack: Jerry O'Connell gets his penis bitten off by the piranha.
* HalfTheManHeUsedToBe: Happens to quite a few bikini babes. Two notable examples:
** Two girls get sliced by a flying steel cable and...
** A few scenes later, one seemingly uninjured girl being hauled ashore by a couple of cops literally falls apart in their arms.
* HazardousWater: Though even slightly above it isn't better, as the piranha can jump a few inches and latch on to anything danging. [[spoiler: Kelly Brook dies this day, as the piranha grab her hair as she rappels over the water and her trying to remove them and keep going just leads to them getting her arms too.]]
* HeroicSacrifice: One of the sheriff's deputies grabs an engine and propeller and holds it in the water to chop of swarms of piranha in an effort to allow more people to get to shore. The fish quickly get to his legs since he has to stand in the water to do this, but he keeps going until he's fully devoured.
%%* HorrorDoesntSettleForSimpleTuesday: Spring Break.
* HookerWithAHeartOfGold: A porn actress rather than a hooker, but Kelly Brook's character is otherwise this to a tee. She quickly becomes a sort of surrogate CoolBigSis to the teenage hero, [[ShipperOnDeck tries to get him to kiss the girl he has a crush on]] and is the only character to show grief when [[spoiler: the {{Jerkass}} porn producer dies. Not that any of this stops her becoming fish food of course]].
* HotterAndSexier: Than the previous versions, by far - lots of nudity, including the aforementioned nude ballet.
* ImprovisedWeapon: Ving Rhames' character runs out of ammo, so he takes the motor off of a boat and uses it to chop piranhas up like a blender.
%%* InfantImmortality: Curiously played straight, unlike the original.
* LargeHam: Creator/ChristopherLloyd, of course. Jerry O'Connell also gets really into his role, to hilarious effect.
%%* LudicrousGibs Not surprising, considering the fact that many characters are...
* MadeOfPlasticine: Some of the results of the attacks look like this, particularly the girl who's accidentally pulled in half while being carried to shore.
* MoodWhiplash: Goes from goofy 'teens on a porn set' scene, to standard horror movie stuff that could still pass for goofy/comedic, to a several-minute scene of unusually realistic gore.
** Especially the aftermath of the lake massacre where the survivors are being pulled out of the river.
** At one point in the aftermath, you see two girls on a boat holding each other and sobbing, while one of the boys on the boat passes a water bottle to another boat to help care for survivors. What used to be a bunch of douchebag rebellious teens getting massacred quickly turns into a bunch of terrified and traumatized kids trying to pick up the pieces of their foolishness. It's a very sobering switch.
* NiceJobBreakingItHero: Jake's decision to help out with filming the porn video leads to both Kelly and his younger siblings trapped on a boat surrounded by piranhas. [[spoiler: He makes up for it by rescuing Kelly and blowing up the boat along with hundreds of piranhas.]]
* NoCelebritiesWereHarmed: Averted. Jerry O'Connell said that his character was explicitly based on Girls Gone Wild founder Joe Francis, and insisted on giving him the goriest death in the movie (in an interview O'Connell even stated he had a very low opinion of Francis).
* NudeNatureDance: The underwater ballet scene.
%%* OhCrap: [[spoiler: They're the ''babies''.]]
* PiranhaProblem: It's the ''page image!''
%%* RefugeInAudacity: Good lord.
* SmugSnake: Not really a villain, but audiences just love to hate Derrick Jones' manic douchiness.
* StealthPun: When Jerry O'Connell's [[spoiler:severed penis]] is sinking to the bottom of the lake, two piranhas start fighting over eating it. In other words, [[spoiler:a cockfight.]]
* TeensAreMonsters: One of the teens grabs a boat just for himself and tries to go for shore, running over several people in the process and killing a few of them. Karma gets him when the hair one of the girls he kills jams his propeller and slows him down and the desperate people in the water capsize him.
* ThirdIs3D: The marketing title ''Piranha 3D'' is somewhat confusing, making it look like the film might be a second sequel rather than another reworking.
* TooDumbToLive: Almost everybody but especially the spring breakers, who refuse to get out of the water when the cops and the ''sheriff'' herself tells them that it's an emergency. Words like that usually scream shark or alligator/crocodile if you're in or near deep water.
* TrailersAlwaysSpoil: An annoying example. That scene in the trailers where [[spoiler: a giant piranha leaps out of the water, and snatches a character off the boat?]] ''That's the ending.''
* UnderwaterKiss: It's an underwater ''[[{{Fanservice}} nude]] [[UpToEleven ballet]]'', as mentioned several times above.
* VomitIndiscretionShot: In slow-motion, right at the camera. And it's {{Squick}}-inducing enough in ''2D''...
* WhatHappenedToTheMouse: Cameraman Andrew vanishes without trace three quarters of the way through the movie. It can be safely assumed he was eaten by piranha but it's weird we never see his fate considering all the other victims on the same boat get very graphic and obvious deaths.
** Andrew's fate is actually discovered in the sequel. He's revealed to be alive and currently undergoing therapy along with Deputy Fallon. (Fallon is afraid of the water, Andrew is afraid of fish.)
** Very little thought is given to the spring break massacre after the main characters leave the scene to rescue the sheriff's children.