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->''"It must be some kind of... [[TitleDrop hot tub time machine]]."''
-->-- '''Nick Webber-Agnew'''

A 2010 film directed by Steve Pink (the guy who did ''Film/{{Accepted}}''). Three friends (Adam, Lou and Nick), and Adam's nephew Jacob take a trip to a ski resort where Adam, Lou and Nick used to hang out to relive good times after Lou attempts suicide. However, while getting drunk in a hot tub, Lou spills some Chernobly (a type of Russian Red Bull) onto the hot tub controls, turning it into a time machine. The hot tub sends the four back to 1986, where Adam, Lou and Nick have regained their youth and replaced their 1986 selves. (Jacob, for some reason, is not a zygote. This goes unexplained, though he occasionally goes static like a television image with poor reception.)

A hot-tub repairman (played by Chevy Chase), who may or may not be MrExposition, occasionally drops by to have {{Cryptic Conversation}}s about how to return to 2010 and the consequences of changing the past. This, however, doesn't stop the three from trying, much to the dismay of Jacob, who feels that their actions may put his very existence in jeopardy via the ButterflyEffect.

The last film to be distributed by {{MGM}} before its bankruptcy and reorganization as a pure producer and co-funder.

A sequel was released on February 20, 2015, and takes place 10 years in the future.

!!This film contains examples of:
%% * AlmightyJanitor: Ok, Almighty Hot Tub Repairman.
* AnalogyBackfire:
--> '''Adam:''' By the way, where does it say in the fucking Friendship Handbook that you are the only one who's allowed any fucking problems?
--> '''Lou:''' I forgot that it says in the Asshole Handbook that you can just fuck over your friends whenever you want!
--> '''Adam:''' Actually, it would say that in the Asshole Handbook if it was, like, guidelines for being an asshole, that's what it would say.
* AndStarring: The film buries an "and introducing William Zabka"[[note]]as Rick, though not noted[[/note]] after the cast list in the end crawl, presumably as a joke [[note]]Zabka's first of many screen roles was in the original ''Film/KarateKid'', slightly before the 1986 setting of this film[[/note]].
* ArtisticLicenseHistory:
** Motley Crue's "Home Sweet Home" was already released in 1985; a year before it would have been possible for Lou to create the song.
** A poster for ''Film/{{Rambo}} 3'' is seen on Blane's bedroom wall, despite the film being set over two years before ''Rambo 3'' was released in May of 1988.
** Music/{{Poison}} performing at Kodiak Valley is seen as a big deal and April is covering the band for Spin Magazine, but in 1986 Poison had not yet achieved mainstream fame (that wouldn't happen until 1987).
** Blaine references ''Series/TwentyOneJumpStreet'' when he's arguing that the mains are Commie spies, but that didn't debut until 1987.
** The first time Blaine and Chaz see Jacob, they act as though they've never seen a snowboard before and don't know what it is. Snowboarding has existed as a sport as far back as the 1970s, although in 1986 it was still a niche sport and most ski areas did not allow snowboarders. Still, the ski patrol personnel at Kodiak Valley would definitely know what a snowboard was.
** The Denver Broncos' game winning drive in the AFC Championship game is lampooned despite it taking place in 1987.
** Adam references Sweet Child O' Mine. Appetite For Destruction didn't come out until 1987, and the song itself wasn't released as a single until 1988.
* AsLongAsItSoundsForeign: Invoked. When pretending to be a Russian spy, Nick brandishes the can of Chernobyl like it was a bomb and repeatedly shouts "Dosvedanya!", which is Russian for "Goodbye" or "Farewell."
%% * AsideGlance: Nick, after the TitleDrop.
%% * BadFuture: Inverted, as the movie starts out in one.
%% * BasementDweller: Played straight as an arrow with Jacob.
%% * BiggusDickus: Nick.
%% * BingeMontage: Happens right before the guys travel back in time.
%% * BloodyHilarious: [[spoiler: The bellhop ''[[OverlyLongGag finally]]'' losing his arm.]]
%% * ButtMonkey: Lou
* BreakingTheFourthWall: The film has the scene where the characters realize that the hot tub has taken them back in time. When this dawns upon Nick, he says, "It must be some sort of... [[TitleDrop hot tub time machine]]," and then turns to stare at the audience.
* ButterflyOfDoom: The protagonists transported from 2010 to TheEighties are GenreSavvy enough to avert this. They even reference the butterfly effect. They set out to do everything their '80s selves would've done in the same way they would've done it.
%% * CallingTheOldManOut: "I always knew there was a reason I hated you!"
* ChekhovsGunman: The squirrel Lou projectile vomits on later [[spoiler: changes the original outcome of a football game Lou bet on.]]
* ChronicEvidenceRetentionSyndrome: Adam keeps a box marked "Cincinnati" in his closet, which is apparently evidence of a shameful and shocking NoodleIncident. His friends are horrified that he'd not only keep whatever is inside the box, but plainly mark it "Cincinnati." Adam protests that he can't just throw something like ''that'' away, and he had to mark it so he'd know which box it's in.
%% * ClusterFBomb
* CoitusUninterruptus: Happens when Nick, Adam, and Jacob burst in on [[spoiler:Lou and Kelly.]]
* CompletelyDifferentTitle: The Portuguese title was ''A Ressaca'' which means... "The Hangover".
* CompoundInterestTimeTravelGambit: Happens at the end, when Lou [[IChooseToStay decides to stay in the past]] and is seen as a billionaire when everyone else returns to the present, having used his knowledge of the events in between.
* DelayedRippleEffect: Obviously as an homage to ''Film/BackToTheFuture'', Jacob starts to flicker and disappear as his parents' mating session is interrupted.
* DirtyCommunists: The time travellers are mistaken for communist spies trying to overthrow the American government, after Blaine and the ski patrol find their modern cell phones and [=MP3=] players (which they think are [[ShoePhone spy gadgets]]), and their can of Chernobyl.
* DoubleStandardAbuseFemaleOnMale: Jenny stabbing Adam in the eye for breaking up with her is treated fairly trivially. Despite knowing what she did Adam and his friends still think he shouldn't have broken up with her and when Adam does get angry at her its for her hypocrisy for [[spoiler:getting mad at him when she was going to break up with him anyway]] not for being violent in the first place. Not once does anyone comment that stabbing someone in the eye is a despicable, abusive act.
* DrivenToSuicide: At the end of the film [[spoiler:Lou confesses that he ''was'' trying to kill himself at the start of the film]].
* [[invoked]] DudeNotFunny: [[spoiler:Kelly is appalled when Lou starts laughing at the Bellhop losing his arm]].
* ExtremelyShortTimespan: The 1986 portion of the movie plays out during one night.
* EyeScream: Averted with Adam, who was stabbed in the eye''brow''. Still, pretty close call.
* FallenOnHardTimesJob: At the beginning of the film, Nick has a job cleaning shit out of dogs' asses.
* TheFatalist: Adam.
-->'''Adam''': All the choices we make in our life are pointless. There's no escaping the inevitable.
* FightFurYourRightToParty: A music-driven montage showing the main characters enjoying the titual hot tub [[BingeMontage while getting hammered]]. At some point the increasingly fragmented and spinning shots start showing a guy in a large bear suit partying with them.
* ForWantOfANail: The bar bet turns into a nightmare for Lou. The squirrel that was vomited on in an earlier scene changes the history of the NFL playoff game as it disrupts John Elway's pass on the field.
%% * TheFriendNobodyLikes: On Lou:
%% --> '''Nick:''' You know how every group of friends has that one asshole? He's our asshole.
* GivingRadioToTheRomans: PlayedForLaughs - Lou decides to stay in the 1980s instead of returning to his present, and spends the intervening time becoming a billionaire by getting in on the ground floor of every important innovation since between then and now.
* GoingFurASwim: One of the ladies in the film is clearly wearing just a bikini top beneath her fur jacket.
* HairTodayGoneTomorrow: Lou is as bald as the actor who plays him - Rob Corddry. When they first arrive in the past he goes to take a piss and catches sight of himself in the mirror. He's so in awe of his own former glory that he doesn't even stop pissing as he turns to stare in dumbfounded wonder.
* HeavyMetalUmlaut: [[spoiler:Mtley Le, Lou's multi-platinum-selling band in which he rose to fame after [[IChooseToStay deciding to stay in the past]]]].
* HenpeckedHusband: Nick starts out as this, becoming a hyphenate (taking his wife's last name), giving up his dream of being a musician to please her, and [[spoiler:putting up with his wife cheating on him because he doesn't have the courage to confront her about it]].
%% * HeroicBastard: Jacob [[spoiler:,at least until Lou (who, it turns out, is Jacob's father) changes the past so that he and Adam's sister get married.)]]
* HighConcept: "Must be some sort of... [[TitleDrop hot tub time machine.]]"
* HumiliatingWager: The humiliating bar bet on the outcome of a football game. Because they slightly changed the timeline, the game ends differently, so Lou loses his bet and has to give Nick a blow job in front of everybody.
* IChooseToStay: [[spoiler:Lou choses to stay his younger self in 1986 [[TheSlowPath and relive his life]], instead of going back to 2010 with his friends. Adam also choses to stay behind, but ends up falling into the hot tub during the return trip]].
* InterruptedIntimacy: Adam, Nick and Jacob walk in on Lou having sex with Adam's sister, meaning Jacob [[PrimalScene witnesses his]] [[{{Squick}} own conception]]...sort of. When he tries to attack Lou, he disappears. CoitusUninterruptus has to ensue to ensure Jacob lives.
* ImStandingRightHere: Believing Lou to be asleep, Nick and Adam start having listing off all the reasons why Lou's life sucks and why he'd want to kill himself. Lou is not asleep, and he calls them out for it.
* InvadedStatesOfAmerica: {{Discussed|Trope}}. Blaine's gang thinks that the time traveling main characters are actually Soviet spies, due to their odd behavior, and the modern-day gadgets that he found in their bags. He mentions the film ''Film/RedDawn1984'', which he owns a poster of in his room.
%% * ItsNotYouItsMe: Played straight, both when Adam originally broke up with his girlfriend, [[spoiler:and again in the AlternateTimeline when ''she'' dumps ''him'' (which she was gonna do in the original timeline anyway)]].
* KnightTemplar: Blaine and his ski patrol friends. They have a legitimate mission of maintaining law and order on the mountain, but they use this and the [[DirtyCommunists Red Scare]] as an excuse to be {{Jerkass}}es.
%% * LeaningOnTheFourthWall: After Nick says, "[[TitleDrop It's some kind of hot tub-time machine]]".
* ALittleSomethingWeCallRockAndRoll: It's [[HipHop hip-hop]] instead of rock, but Nick, after performing his cover of Rick Springfield's "Jesse's Girl", wows the audience of 1986 with his rendition of [[spoiler:"Let's Get it Started" by Music/BlackEyedPeas]].
%% * LukeIAmYourFather: This revelation comes as a shock to both Lou and Jacob.
* ManicPixieDreamGirl: April. Played surprisingly straight, she just appears in Adam's life, fixates on him (particularly odd, since she's apparently an established music journalist and Adam's a teenager), takes him out of the dull funk that he's in, and even engages in some low-level breaking and entering for the sake of romance.
%% * TheMasochismTango: [[spoiler: Lou and Kelly]]. And loving it!
* MaybeMagicMaybeMundane: ''Film/HotTubTimeMachine'' repeatedly draws attention to this trope and straddles a strange line between playing it straight and parodying it in the character of the Hot Tub repair man, who may just be a {{cloudcuckoolander}} repair man, or may be some sort of TimePolice setting the time travelers on their way. Jacob even lampshades it, by noting that the repairman's words perfectly support either theory, and asks if it would kill the repairman to just give him a straight answer.
%% * MentalTimeTravel: For everyone but Jacob.
* MetalHead: The teenage version of Lou has long hair, a leather jacket, and an Music/IronMaiden t-shirt. Making him a pretty typical 1980s metalhead.
%% * MistakenForSpies
* MisterSandmanSequence: The film has one of these when the four protagonists reach the ski lodge and realize that it's TheEighties. Featuring leg warmers, [[RonaldReagan Reagan]], EightiesHair, ''MiamiVice'' T-shirts, cassette players, cell phones the size of bricks, {{MTV}} [[NetworkDecay playing music videos]], and more all to set the mood.
-->'''Nick:''' What color is Music/MichaelJackson?
-->'''Girl:''' Black?
* ModestyBedsheet: [[spoiler:When Adam, Nick, and Jacob walk in on Lou and Kelly having sex, the bedsheet is positioned to prevent any kind of nudity from being seen]].
* MsFanservice: Tara (the busty groupie that Nick hooks up with) and Zoe (the girl who "only does two at a time"). Both women have very small roles, yet both appear topless.
%% * NeverMyFault: Adam has a bad case of this.
* NeverTrustATrailer: Nick's best line in the trailer, re: his fetish for ''Series/TheGoldenGirls'', isn't in the movie.
* NoodleIncident:
** Adam, Nick and Lou twice perform a reverent (and unexplained) round chant of "Great white buffalo..."
** Whatever happened in Cincinnati. Lou is horrified that Nick kept something from the incident in his closet, labelled "Cincinnati" no less, but Nick implies that it would be too dangerous to try to dispose of it.
%% * NoOntologicalInertia: Played with with Jacob, who has perplexing ontological inertia.
* NostalgiaFilter: At first Adam can't remember ''why'' he broke up with his old girlfriend, Jenny, and because he only recalls good things about her he believes that he made a huge mistake by dumping her. [[spoiler:Once we actually meet her in the past and find out how shallow and crazy she is, it's not hard to see why Adam dumped her. [[TheFatalist But he was still unhappy with the whole situation]]]].
* NotGoodWithRejection: In the original timeline, Jenny stabs Adam in the eye with a fork after he breaks up with her.
%% * ObiWan: Parodied with the repairman.
* TheObiWannabe: The mysterious repairman delivers lots of [[IceCreamKoan cryptic and ominous-sounding warning]], from which the gang infers that doing anything differently will screw up the timeline in unpredictable ways (like a vomit-covered squirrel changing the outcome of a pro-football game). [[spoiler:They end up defying him, and it turns out to be largely BS as Lou stays in the past to redo his life and makes his life infinitely better by the present day]].
* TheOneThatGotAway: Adam views his old girlfriend Jenny as this. But once he goes back in time and starts hanging out with her again it's easy to see why he broke up with her. Then he becomes [[TheFatalist depressed]] about it, especially after finding out she was originally gonna dump ''him'', believing the choices he made in his life are pointless.
* OrangeBlueContrast: The whole movie has a deep teal and orange tint.
* OurTimeMachineIsDifferent: The Hot Tub. Seems obvious, right?
%% * PercussiveMaintenance: Jacob, when he starts going static.
* PetTheDog: Blaine and his ski patrol buddies spend most of the film as complete [[JerkAss jerkasses]], but in the end [[spoiler:they manage to redeem themselves somewhat by working quickly and professionally to save the Bellhop's arm]].
* PillarOfLight: When transporting the group back to the present, the hot tub builds a glowing vortex reaching into the sky.
%% * PlayingGertrude: Kelly and April in the future. Kelly especially because at they tried to make April look older.
%% * PoliticallyIncorrectHero: Lou. [[spoiler:During the ending he even refers to his wife and son as "faggots."]]
* PortalPool: A hot tub serves as a portal to the past.
* ReallyGetsAround: Adam's sister, Kelly. The first time we meet her she openly expresses her desire to have sex with a member of the ski patrol. [[spoiler: Later that night, she ends up having drunken sex with Lou (and conceiving Jacob in the process).]]
* RepeatingAd: On the weekend it came out in theatres, commercials for the film could be seen nine times in just over an hour.
%% * RippleEffectProofMemory: [[spoiler: When the gang comes back to the future, they have no memory of Lougle or the success that they have enjoyed for the last few decades.]]
%% * RuleOfFunny: The overriding principle in the name of which all errors mentioned herein can easily be excused.
* RunningGag:
** The bellhop repeatedly failing to lose his arm in situations where he should have.
** In the deleted scenes, it's revealed that Miss Only-Does-Two-Guys-At-A-Time ensnared a significant percentage of the male cast during the night, but each time one of them running off.
%% * ScrewDestiny
%% * SetRightWhatOnceWentWrong: [[spoiler:What the guys end up doing once they summon up the brass to defy the repairman and do things the way they wish they had. In the end it results in them all having much better lives than they did before]].
%% * SexDrugsAndRockAndRoll: Check, check, and check!
* ShoutOut:
** A very subtle one to ''Franchise/TheHitchhikersGuideToTheGalaxy''. It's squirrels instead of mice, but there's clearly more than meets the eye going on with them.
** Also, while Adam is talking with the ManicPixieDreamGirl in the house they broke into, a quick "Okay, so you're a [[Series/DoctorWho Time Lord]], and this hot tub is your [[TimeAndRelativeDimensionsInSpace space ship]]". This scene is also framed like the final scene of ''Film/SixteenCandles''.
** "I want my two dollars!" is a reference to Creator/JohnCusack's early film ''Film/BetterOffDead''. (Its even mentioned as a DVD subtitle).
** When Lou [[spoiler:finally snaps and beats up Blaine]] it's an obvious (shot-for-shot and [[spoiler:punch-for-punch]]) reference to a similar scene in ''Film/AChristmasStory''. And just before that happens, someone in the room shouts "[[Film/TheKarateKid Get a body bag]]!"
* TheSlowPath: [[spoiler:Lou stays behind in the past because his life in the original time line sucked. He uses the opportunity to make better decisions, and uses his knowledge of the future to become very rich. It's played with, though, because his physical age remains the same--his mind from the present had traveled back to inhabit his younger self]].
* SpiritualSuccessor: From the TimeTravel, to the MisterSandmanSequence, to standing up to the bully and his toadies, to the [[ALittleSomethingWeCallRockAndRoll A Little Something We Call Hip-Hop]] scene, to the search for the AppliedPhlebotinum in order to get back, to the minor part played by Crispin Glover, this is ''Film/BackToTheFuture'' for a new generation... or more like the same generation, but inverted.
%% * TheStoner: Adam has enough illegal drugs in his briefcase to overdose an elephant.
* SuckECheeses: Adam tells a story about how his father (and several others) died of salmonella poisoning after going to The Enchanted Forest of Pizza, a fantasy-themed pizza place.
* SuddenlySober: Adam from takes coke, weed and mushrooms in his hotel room and can't even get up from the floor. His nephew, Jacob, then bursts into the room and tells him he needs his help. Adam is completely sober in the next scene.
%% * TechnologyMarchesOn: Pointed out in-universe.
%% -->'''Nick:''' Somethin's goin' on in here. Dude is rockin' a ''cassette player''. !
* AThreesomeIsManly: Lou and Jacob meet a woman who claims she only does "two at a time." But Jacob refuses to participate, much to Lou's disappointment.
-->'''Lou:''' Every young man dreams of having a threesome!
-->'''Jacob:''' Not with another dude!
-->'''Lou:''' It's still a threesome!
* TimeTravelersAreSpies: Blaine and the ski patrol mistake the main characters for Soviet spies after finding their cell phones and [=MP3=] players (which they think are [[ShoePhone spy gadgets]]), and their can of Chernobyl energy drink with its [[TheBackwardsR Cyrillic lettering]] (which they think is a bomb).
* TimeyWimeyBall: The film is really inconsistent with its time travel mechanics. Four friends travel back to one day in 1986 and hijack their younger bodies, so everyone sees them as their younger selves. Except one of the friends - Jacob - wasn't born yet and looks the same in the past as he did in the present, and can also interact with the past, but whenever something happens that might possibly stop his conception he flickers out temporarily. Initially the friends, fearing the ButterflyOfDoom, try to enact a StableTimeLoop by making sure the big events they remember from that night still happen, but then they change their minds and try to make sure the night goes better the second time around. Some of the big events they remember still happen no matter what they do, but no in the way they remember them. Other events they really do alter. Meanwhile they directly or indirectly cause a couple of historical changes. [[spoiler:In the end Lou decides to stay behind and use his knowledge of the future to greatly improve his and everyone's lives. When the other three friends get back they all have much better lives but do not remember them]].
* TitleDrop: "It must be some kind of...Hot Tub Time Machine." Craig Robinson lampshades the trope by delivering a deadpan AsideGlance to the camera immediately after saying the line.
* TrailersAlwaysSpoil:
** Depending on which trailer you saw, one of them shows [[spoiler:Lou aboard the huge yacht he bought himself after inventing Lougle, therefore spoiling the fact that he stays in the past]].
** Another trailer showed Jacob [[spoiler:seeing his mother in 1986, and then shows her in bed with Lou saying "I feel pregnant"]].
* TwentyMinutesIntoThePast: Was made in 2010 and may be intended to take place in 2006, before the iPhone came out.
* TwoPersonPoolParty: Nick's younger self is having hot tub sex with a girl named Tara.
%% * ValleyGirl: April.
* VomitIndiscretionShot:
** [[spoiler:Jacob pukes on Lou when the Bellhop's arm gets ripped off by a passing snowplow]].
%% ** A particularly nasty one. For extra credit bonus points, it hits a squirrel.
* WeirdnessSearchAndRescue: The guy who fixes the hot tub and acts like he knows about time travel. However, he doesn't ''tell'' them about the time travel.
* WealthyEverAfter: The film ends with Lou remaining in the past and using his knowledge of the future for personal financial gain. By present day he is a multi-billionaire. His other friends are also better off than they were before their time travel adventure.
* WealthyYachtOwner: Lou exploits his knowledge of the future to become a billionaire. At the end of the film he is seen aboard a huge yacht named ''Violator''.
* WhatTheHellHero: After being beaten up by Blane and his friends, Lou emotionally chastises Nick and especially Adam for being piss-poor friends who are never around when he needs them. Adam argues at first, but eventually has to admit that Lou is right.
* WhatTheHellIsThatAccent: InUniverse. Adam's fake Russian accent sounds nothing like a real Russian accent.
* WhatYearIsThis: A clever variation appears: instead of directly asking the year, Nick asks, "What color is Music/MichaelJackson?" (The answer "black" confirms he has traveled into the past).
* WrongNameOutburst: During Nick's intense pool sex scene he shouts out the name of his wife, Courtney, while the girl insists on being called Tara.

!!The sequel contains examples of:
%% * AssholeVictim: Lou
%% * GroinAttack: Someone subjects Lou to this at the start.
%% * ItCanThink: The smart car
%% * SadistShow: In-universe these are very popular
%% * WhodunnitToMe: The main plot