''Twins'' is a 1988 comedy directed by Ivan Reitman, starring Creator/DannyDeVito and Creator/ArnoldSchwarzenegger as twins.

Yes, ''that'' [[TheNapoleon Danny [=DeVito=]]] and [[TheAhnold Arnold]] [[Franchise/{{Terminator}} Schwarzenegger]].

Julius and Vincent Benedict are fraternal twins; the results of a secret experiment carried out at a genetics laboratory to produce the perfect child, using sperm donated by six different fathers. The mother was told that the children died at birth, while the children were informed once old enough that their mother died in childbirth. The program was a success but was shut down, due to one twin inheriting the "desirable traits", and the other being the "genetic trash": Julius is strong, handsome, kind and intelligent, while Vincent is, well, [[TypeCasting Danny [=DeVito=]]].

The two meet when they're both 35 and Julius bails Vincent out of jail. Vincent doesn't warm up to Julius right away, but he soon does.

Vincent steals a car that happens to have a secret prototype fuel injector worth five million dollars in the trunk. He is going to drive to Houston to sell it for money he owes to loan sharks, but Julius finds out that their mother is really alive and they might be able to find her, and the drive to Houston soon turns into a road trip with Vincent, Julius, Vincent's girlfriend Linda and Linda's sister Marnie. They are pursued by Webster, the criminal responsible for transporting the fuel injector. HilarityEnsues.

News broke in Summer 2013 that a sequel, called ''Triplets'' is planned with Creator/EddieMurphy as the third brother. That sound you can hear is the entire world doing a collective ''[[FlatWhat "What?"]]''

!!This film provides examples of:

* {{Adorkable}}: Julius, especially on the topic of women.
* BadassAdorable: Julius is an interesting example; he is adorable not because of his appearance, but because of his gentle, innocent and kind-hearted personality.
* BabiesEverAfter: At the end, lo and behold, [[spoiler: the twins have [[LoserGetsTheGirl married the twins]] and have each had... twins]].
* BaitAndSwitch: In the last scene, when the mother notes "I just can't get over how alike they are", the camera cuts to [[PolarOppositeTwins Julius and Vincent]] but then [[RevealShot pans down]] to the [[AlwaysIdenticalTwins twin babies]] in the buggies.
* BedroomAdulteryScene: Vincent's introductory scene.
* BerserkButton: Vincent finds out the hard way that calling Burt Klane a "blimp" isn't the ''smartest'' thing to do.
* BewareTheNiceOnes: Julius. He doesn't want to hurt you; that doesn't mean he ''can't''.
* BigBrotherInstinct: Julius develops this ''immediately.''
* BigGuyLittleGuy: And it's rather hard to get them mixed up.
* BlatantLies: Dr. Mitchell Traven denied any knowledge of the program. ("I don't know who you are, and I don't know what you're talking about!") This pissed Julius off.
* BondOneLiner: During the final confrontation, once the chains finally finish piling up on the villain, Vincent looks in mild shock before delivering "Now there's a guy with a lot on his mind."
* ButIReadABookAboutIt: Julius knew all about driving from reading about it, and having read the car's manual, he knew he could shut off the alarm by lifting it up from the back, thereby tricking it into thinking it was being towed. Of course it only worked because of his extraordinary strength.
* CarSkiing: Julius does one of these ''completely by accident'' his first time driving a car.
-->'''Julius:''' Maybe I can teach you that sometime.\\
'''Vincent:''' Julius, let me give you a little advice: here in America, nobody likes a smartass.
* CassandraTruth: No one ever believes that Vincent and Julius are twins.
* CoatOverTheShoulder: Vincent gets them matching sets of cool white suits. They simultaneously flip their jackets, with Julius's jacket floating over Vincent.
* ConscienceMakesYouGoBack: Julius makes Vincent grow a conscience, which irritates Vincent to no end.
-->'''Julius:''' Why did you come back?\\
'''Vincent:''' Why? I'll tell you why, it's because I have a disease called a conscience.\\
'''Julius:''' No one said doing the right thing was easy.\\
'''Vincent:''' "[[SarcasmMode No one said doing the right thing was easy.]]"
* CurbStompBattle: Julius' fight with the Klane heavy in Vincent's office. Later he easily dispatches four of them in the nightclub.
* TheCynic: Vincent has had one too many disappointments in his life to believe in concepts like love, kindness and hope.
* DesignerBabies: Julius and Vincent are the results of a secret experiment carried out at a U.S. Government genetics laboratory to produce the perfect child. To the surprise of the scientists, the embryo split and twins were born. One twin, Julius, is seemingly "perfect", exhibiting all the traits the scientists were hoping to achieve, while the other, Vincent, is much more "average", to the scientists' dismay.
-->'''Mitchell Traven''': The embryo ''did'' split in two, but it didn't split equally. All the purity and strength went into Julius. All the crap that was left over went into what you see in the mirror every morning.
* DoubleInLawMarriage: The end has the twins marrying sisters.
* DrJerk: Dr. Mitchell Traven ''at best'', bordering on MorallyAmbiguousDoctorate. It's not possible to justify breaking up a family the way he did, no matter ''what'' his reasons for it.
* EvenBadMenLoveTheirMamas: Vincent, at least when he finds out he was lied to when told he was a SonOfAWhore. Of course, by the time he and his true mother meet, he's not really ''that'' bad anymore.
* FlatWhat: Vincent's reaction when Julius told him he's his brother.
* GeniusBruiser: Julius.
* GentleGiant: Keep in mind that this role was very much PlayingAgainstType for Arnie at first, since he was then-known either as an {{action hero}} or Film/TheTerminator.
* GrandRomanticGesture: Vincent has his love interest's room decorated with flowers. She is floored.
* TheGrovel: Towards the end during his GrandRomanticGesture, Vincent is on his knees begging his love interest for forgiveness. It works.
* HasTwoMommies: How many fathers do the twins have?
* HawaiianShirtedTourist: The two couriers who deliver the car to the garage try to pass themselves off as tourists by wearing Hawaiian shirts.
* HeroStoleMyBike: Julius jacks a convertible with buffalo horns on the hood in Twins, but later mentions that he returned it.
* HotForTeacher: Vincent somehow managed to seduce Sister Maria, one of the nuns who was his biology teacher at the orphanage where he grew up. This resulted in Sister Maria losing her job before he ran away.
* {{Hypocrite}}: Vincent accuses Linda of accompanying him on the journey because her interests were only financial, even though five million dollars is exactly what motivated his road trip in the first place. Though he likely just taking his anger on the news of his mother's supposed death on her.
* InformedAbility: Some of Julius' abilities, like his superior skill at math. Justified in that only some of his skills are relevant to the plot, and usually only for a single scene each.
* InTheBlood: Done in a more controlled and planned manner than usual. Dr. Traven and his team took sperm from men who excelled in all fields -- a Nobel Prize-winning scientist, a bodybuilder etc. so they could create someone who was literally a master at ''everything''. The embryo's split into a "good" twin and a "bad" twin in Mary-Ann's womb, however, was not planned for.
* {{Jerkass}}: Mitchell Traven. He treats Vincent like crap, because his unexpected birth was the reason the program was shut down. Also because of it, he told Mary Ann, their birth mother, that her child died at birth.
* JerkWithAHeartOfGold: Vincent, after some CharacterDevelopment.
* KavorkaMan: Vincent. Prior to meeting Julius, he doesn't have many redeeming features but nevertheless seems to have had no trouble attracting women.
* KindheartedCatLover: Vincent.
* LaserGuidedKarma: Ultmately everyone gets what they deserve, for good or ill. [[spoiler:The twins forge a permanent bond, marry a pair of good-looking, good-hearted women and each gets a set of twins of their own. Mary Ann, having long believed her only son died at birth, discovers she actually has ''two'' and gets the chance to reconnect with them. Meanwhile Webster, a FauxAffablyEvil murdering bastard who [[ShootTheMessenger killed the two men who hired him]] and offed [[AntiVillain Beatroot]], gets violently crushed by a chain-hook and a long length of metal chains. Dr. Traven, who isn't a villain but still acted like a bitter old crank and a jackass, gets sucker-punched for his own bad deeds (because at least he didn't kill anyone).]]
* LoanShark: Vincent is hounded by the family of loan sharks almost every other scene. {{Played for laughs}}, as they are continuously injured and quite [[IneffectualSympatheticVillain non-threatening]].
* LongLostRelative: Julius and Vincent were SeparatedAtBirth. Vincent was placed in an orphanage in Los Angeles, Julius was taken to a South Pacific island and raised by Professor Werner. Each twin is unaware of the other's existence until Vincent learns of his twin brother in his 35th birthday.
* MamaBear: Mary Ann, after she learns about Dr. Traven's little white lie. "You stole my family... you lying son of a ''BITCH!!''"
* ManChild: Julius has a lot of child-like innocence due to spending his whole life on an island.
* MissingMom: Julius was informed that his mother [[DeathByChildbirth died in childbirth]]. Vincent believed his mother abandoned him.
* MistakenIdentity: When they first meet, Vincent thinks Julius is a debt collector working for the Klane brothers.
* MixAndMatchMan: Julius and Vincent are DesignerBabies with combined DNA from six athlete and scholarly fathers. Vincent lost out in the process though.
* TheMoralityMortalityEquation: Beatroot's associates get killed just for seeing Webster's face, even though as far as the audience is aware [[PunchClockVillain they're just a couple of guys doing their job]]. [[spoiler:Beatroot himself suffers the same fate near the end, for the exact same reasons.]]
* NatureVsNurture: Because of the unexpected birth of twins, the experiment was ended and the mother/children split up. Julius ended up with one of the scientists who genuinely raised the boy to be a genius bodybuilder ("the Good") in an isolated environment void of cultural distractions. Vincent was left abandoned to an orphanage, without any mentor or guidance to grow up, and learned to cheat and lie his way through life ("the Bad") while living a hedonistic unhealthy lifestyle. The argument would be how much did genetics already establish which twin was Good or Bad, and how much did they grew up the way they grew up? Lampshaded by Julius, who realizes he had the more coddled childhood and condemns Dr. Traven for pre-judging Vincent to a harsher life.
-->"I was taken to a beautiful island, protected, educated, loved, given every opportunity to grow, to dream, to create. But you had none of that. You had ''nobody.'' Nobody to love you, nobody to trust you, nobody to encourage you. All life taught you was that the only person you could count on was yourself."
* NiceGuy: Julius.
* NobleDemon: Beetroot honors the deal he made with Vincent, even though he realizes by then that Vincent obviously got ahold of it by accident, and probably doesn't even "know what the hell this thing is"; after explaining what it is, he leaves the promised payment and leaves with the goods. [[spoiler:Unfortunately for Beetroot and his assistant, Webster isn't noble at all, gunning them down in cold blood just before Julius arrives, leading to the climax.]]
* OhCrap: Vincent's celebration of getting his money is cut short when he hears gunshots and Beetroot's car crashed.
* OverlyLongGag: The chain.
* PetTheDog: Or cat in this case. Vincent, despite being a moneygrubbing lech until he meets Julius, is very kind and loving towards his pet cat, ironically named Julius.
** Dr. Werner had hoped Julius would stay with him after learning he had a twin, but Julius was insistent on leaving to find his twin brother, so Werner let him leave. That's as nice as he gets and it's all downhill from there.
* PolarOppositeTwins: [[CaptainObvious Duh.]]
* PsychoForHire: Webster. He kills anyone he meets in person so they can't identify him, even if that person is the one who hired him.
* RaisedByDudes: Arnold's character is raised by scientists (with one of them being more of a father figure to Julius) while his biological parents (all seven of them) are excluded. When he ventures into normal society, he is very much a FishOutOfWater.
* RuleNumberOne: The rules of a crisis situation:
--> '''Rule 1:''' Don't move too soon.\\
'''Rule 2:''' If you choose to bluff, you must be prepared to have your bluff called.\\
'''Rule 3:''' Duck.
* SeparatedAtBirth: Natch. All because of Dr. Traven.
* SomethingElseAlsoRises: When Marnie falls asleep on Julius, it causes his bicep to bulge to the point where it rips his shirt.
* TookALevelInJerkass: Of course Vincent was kind of a jerkass his whole life, but became a bigger jerkass after he was told their mother died and took it out on Linda and Julius.
** He was also told that he wasn't planned and was made out of everything they didn't want in Julius. That certainly didn't do much for his mood.
* TwinTelepathy: Naturally. The Twins are even in constant synchronization, much to Vincent's initial annoyance. [[WeNamedTheMonkeyJack Vincent named his first cat Julius, and Julius named his first computer Vincent]]. When either brother is hurt, both feel pain. Vincent actually gives up the five-million-dollar payoff in an attempt to rescue Vincent he's pretty sure won't work specifically because Julius has given him a [[ConscienceMakesYouGoBack conscience that won't quit nagging him]].
* VirginShaming: Julius is revealed to be a virgin, unsurprisingly since he's spent his whole life on a desert island with no women around, and is embarrassed when Vincent teases him about it.
* WhateverHappenedToTheMouse: We never find out if the loan sharks are still after Vincent. Though after getting the reward money, he likely paid them off, or they were arrested at the bar.
* WideEyedIdealist: Julius.
* WinsByDoingAbsolutelyNothing: Near the beginning, a motorcycle-riding thief tries to steal Julius's suitcase. Julius is so strong that he is able to hold onto the suitcase without even noticing that the man was trying to steal it, which yanks the thief right off his motorcycle. Julius actually thinks the man got caught on his suitcase and unironically tries to give him medical assistance while apologizing profusely.