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*Gang bangers in small city's have been know to team up against police and non-local gangs moving in then go back to fighting each other again.
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*** During and immediately after World War II, anti-Japanese sentiment was very strong in America. All that was forgotten when the U.S. jumped at the chance to make Japan a capitalist ally against the People Republic of China, North Korea, and the eastern part of the Soviet Union.
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** [[EastGermany Didn't work out so well for Germany in the long run, did it?]]
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** Most recently, there are those on both the left and right side of American politics that have united in opposition of President Obama's use of drones in warfare, particularly his failure to rule out using them on Americans ''on American soil!''
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*** Worth noting, at the same time, the Irish also had plans in place for fighting off a ''British'' invasion with ''German'' assistance. Ireland's stragegically valuable location meant they could not afford to assume either side would have qualms about invading if it meant launching or averting an invasion of Great Britain.
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** Also during the {{Iran-Iraq War}}, Iran received a great deal of weapons and aid from Israel, because both countries considered SaddamHussein a far greater enemy (Hussein in fact disseminated a notorious pamphlet written by his father-in-law titled "[[http://en.wikipedia.org/wiki/Three_Whom_God_Should_Not_Have_Created:_Persians,_Jews,_and_Flies Three Whom God Should Not Have Created: Persians, Jews, and Flies]]"). Historian Trita Parsi has also claimed that Israel's bombing of Iraq's nuclear facility at Osirak was assisted by Iranian intelligence, but Iran officially denies this.
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** Also during the {{Iran-Iraq War}}, Iran received a great deal of weapons and aid from Israel, because both countries considered SaddamHussein a far greater enemy (Hussein in fact disseminated a notorious pamphlet written by his father-in-law titled "[[http://en.wikipedia.org/wiki/Three_Whom_God_Should_Not_Have_Created:_Persians,_Jews,_and_Flies Three Whom God Should Not Have Created: Persians, Jews, and Flies]]"). Historian Trita Parsi has also claimed that Israel's bombing of Iraq's nuclear facility at Osirak was assisted by Iranian intelligence, but Iran officially denies this. On the Iraqi side, the U.S., Soviet Union, gulf countries, and a variety of other countries, all gave more support to Iraq than Iran.
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* The Westboro Baptist Church, aka the "God hates Fags" church, headed by 'Reverend' Fred Phelps, has managed to bring people with differing views together. This isn't difficult seeing as they've managed to piss off ''absolutely everyone''. Most notably they've managed to unite leftists and rightists against them. Leftists oppose the church due to its ''extreme'' anti-homosexuality stance. Rightists are angry at them for their habit of holding protests at the funerals of US troops killed in Iraq and Afghanistan, where they hold picket signs bearing messages such as "God killed your sons", "Thank God for IED's", and "Thank God for dead soldiers".
** The leftists aren't too pleased about those signs praising the deaths of soldiers either. Even the strongest anti-war activists usually don't want soldiers to die. Which makes sense because most antiwar people consider it a waste of valuable human life.
** All the Christians who are against them, [[http://www.youtube.com/watch?v=LQ8U2lX6EE0 many because they aren't against gays]], but there are even quite a few staunchly anti-gay people who, contrary to popular belief, generally don't want gays to be harmed - they just want them to not be gay. The Catholic Church may be against gay sex (they aren't against actual gays, just the sex) but they also run clinics for [=AID=]s sufferers (and sex workers) in countries that want to string gays up by the neck, as well as offering support etc, spoke out on the Ugandan kill-the-gays law.
** The leftists aren't too pleased about those signs praising the deaths of soldiers either. Even the strongest anti-war activists usually don't want soldiers to die. Which makes sense because most antiwar people consider it a waste of valuable human life.
** All the Christians who are against them, [[http://www.youtube.com/watch?v=LQ8U2lX6EE0 many because they aren't against gays]], but there are even quite a few staunchly anti-gay people who, contrary to popular belief, generally don't want gays to be harmed - they just want them to not be gay. The Catholic Church may be against gay sex (they aren't against actual gays, just the sex) but they also run clinics for [=AID=]s sufferers (and sex workers) in countries that want to string gays up by the neck, as well as offering support etc, spoke out on the Ugandan kill-the-gays law.
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* The Westboro Baptist Church, aka the "God hates Fags" church, headed by 'Reverend' Fred Phelps, has managed to bring people with differing views together. This isn't difficult seeing as they've managed to piss off ''absolutely everyone''. Most notably they've managed to unite leftists and rightists against them. Leftists oppose the church due to its ''extreme'' anti-homosexuality stance. Rightists are angry at them for their habit of holding Their anti-gay protests at drew plenty of condemnation from both the left and right, but even the most anti-gay social conseratives were shocked by their picketing of the funerals of US troops killed in Iraq and Afghanistan, where they hold picket signs bearing messages such as soldiers with sings like "God killed your sons", "Thank God for IED's", and "Thank God for dead soldiers".
** The leftists aren't too pleased about those signs praising the deaths of soldiers either. Even the strongest anti-war activists usually don't want soldiers to die. Which makes sense because most antiwar people consider it a waste of valuable human life.
** All the Christians who are against them, [[http://www.youtube.com/watch?v=LQ8U2lX6EE0 many because they aren't against gays]], but there arechildren". They even quite a few staunchly anti-gay people who, contrary to popular belief, generally don't want gays to be harmed - they just want them to not be gay. The Catholic Church may be against gay sex (they aren't against actual gays, just the sex) but they also run clinics for [=AID=]s sufferers (and sex workers) in countries that want to string gays up got denounced by the neck, as well as offering support etc, spoke out on the Ugandan kill-the-gays law.''Ku Klux Klan''. How low can you get?
** The leftists aren't too pleased about those signs praising the deaths of soldiers either. Even the strongest anti-war activists usually don't want soldiers to die. Which makes sense because most antiwar people consider it a waste of valuable human life.
** All the Christians who are against them, [[http://www.youtube.com/watch?v=LQ8U2lX6EE0 many because they aren't against gays]], but there are
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**** It's a reasonable thought for him to have had. Politics makes strange bedfellows was ''literally'' true in the European ruling houses, most of whom were actually related to each other. Eddie's great-grandfather ''was'' German; the Duke of Saxe-Coburg and Gotha. For that matter, the English royal line stemmed from George I, who prior to becoming King had been the Elector of Hannover. Edward VIII's pro-Nazi leanings were likely the real reason he was hustled off the throne; Wallis Simpson was just the excuse.
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* Companies like Google and Microsoft have always had their controversy. But as soon as bills like SOPA showed their fangs. Suddenly, the entire internet was united to fight back. Whatever the companies fight for freedom or money is unknown. But no one seem to care anyway.
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* Companies like Google and Microsoft have always had their controversy. But as soon as bills like SOPA showed their fangs. fangs? Suddenly, the entire internet was united to fight back. Whatever Whether the companies fight for freedom or money is unknown. But unknown, but no one seem to care anyway.
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** During the Battle of Britain, the British and Irish governments put together a joint plan, [[http://en.wikipedia.org/wiki/Plan_W Plan W]], for the defense of neutral Ireland against German Invasion. One effect of this plan was the Irish military trading in their uniforms (which resembled those of the Germans) for new ones more closely resembling those of the Brits, to avoid spooking jumpy British troops from [[FriendOrFoe shooting at the wrong people.]]
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** Most recently, they even got ''HellsAngels themselves'' working hand-in-hand with law enforcement officers and firefighters to protect the funerals of the Sandy Hook victims from this kind of nonsense ''[[MomentOfAwesome and Anonymous doxing the whole flock]]'' simply for trying to protest at ''those'' funerals.
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** Most recently, they even got ''HellsAngels ''Hell's Angels themselves'' working hand-in-hand with law enforcement officers and firefighters to protect the funerals of the Sandy Hook victims from this kind of nonsense ''[[MomentOfAwesome and Anonymous doxing the whole flock]]'' simply for trying to protest at ''those'' funerals.
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** Most recently, they even got ''HellsAngels themselves'' working hand-in-hand with law enforcement officers and firefighters to protect the funerals of the Sandy Hook victims from this kind of nonsense ''[[MomentOfAwesome and Anonymous doxing the whole pack of fanatics]]'' simply for trying to protest at ''those'' funerals.
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** Most recently, they even got ''HellsAngels themselves'' working hand-in-hand with law enforcement officers and firefighters to protect the funerals of the Sandy Hook victims from this kind of nonsense ''[[MomentOfAwesome and Anonymous doxing the whole pack of fanatics]]'' flock]]'' simply for trying to protest at ''those'' funerals.
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** Most recently, they even got ''HellsAngels themselves'' working hand-in-hand with law enforcement officers and firefighters to protect the funerals of the Sandy Hook victims from this kind of nonsense ''[[MomentOfAwesome and Anonymous doxing the whole pack of fanatics]]'' simply for trying to protest at ''those'' funerals.
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* Companies like Google and Microsoft has always had their controversy. But as soon as bills like SOPA showed their fangs. Suddenly, the entire internet was united to fight back. Whatever the companies fight for freedom or money is unknown. But no one seem to care anyway.
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* Companies like Google and Microsoft has have always had their controversy. But as soon as bills like SOPA showed their fangs. Suddenly, the entire internet was united to fight back. Whatever the companies fight for freedom or money is unknown. But no one seem to care anyway.
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* Companies like Google and Microsoft has always had their controversy. But as soon as bills like SOPA showed their fangs. Suddenly, the entire internet was united to fight back. Whatever the companies fight for freedom or money is unknown. But no one seem to care anyway.
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* The [[TheWarOnTerror September 11 attacks]] brought a few of these out of the woodwork, as governments who aren't exactly known for their fondness of the American government condemned the attacks and the terrorism that caused them. Among these governments? ''North Korea and the Taliban''. (At least officially.)
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* The [[TheWarOnTerror September 11 attacks]] brought a few of these out of the woodwork, as governments who aren't exactly known for their fondness of the American government condemned the attacks and the terrorism that caused them. Among these governments? ''North ''Iran, North Korea and the Taliban''. (At least officially.)
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*** In ''Mein Kampf'' Hitler declares his intention to conquer USSR. It appears that the Soviet Union was the only place where it was read.
** The United States, Great Britain, and the Soviet Union worked side by side to defeat Germany, Japan and Italy
** Winston Churchill was a staunch anti-Communist, but he promised help to the Soviet Union immediately after Hitler attacked it. He once said, "If Hitler invaded Hell I would make at least a favorable reference to the devil in the House of Commons."
** The United States, Great Britain, and the Soviet Union worked side by side to defeat Germany, Japan and Italy
** Winston Churchill was a staunch anti-Communist, but he promised help to the Soviet Union immediately after Hitler attacked it. He once said, "If Hitler invaded Hell I would make at least a favorable reference to the devil in the House of Commons."
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*** In ''Mein Kampf'' ''Literature/MeinKampf'' Hitler declares his intention to conquer USSR. It appears that the Soviet Union was the only place where it was read.
** The United States, Great Britain, and the Soviet Union worked side by side to defeat Germany,Japan Japan, and Italy
**Winston Churchill WinstonChurchill was a staunch anti-Communist, but he promised help to the Soviet Union immediately after Hitler attacked it. He once said, "If Hitler invaded Hell I would make at least a favorable reference to the devil in the House of Commons."
** The United States, Great Britain, and the Soviet Union worked side by side to defeat Germany,
**
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* The Iranian Revolution brought together (for a brief period of time) leftists, communists and fundamental Islamists.
** Also during the IranIraqWar, Iran received a great deal of weapons and aid from Israel, because both countries considered Saddam Hussein a far greater enemy (Hussein in fact disseminated a notorious pamphlet written by his father-in-law titled "[[http://en.wikipedia.org/wiki/Three_Whom_God_Should_Not_Have_Created:_Persians,_Jews,_and_Flies Three Whom God Should Not Have Created: Persians, Jews, and Flies]]"). Historian Trita Parsi has also claimed that Israel's bombing of Iraq's nuclear facility at Osirak was assisted by Iranian intelligence, but Iran officially denies this.
** Also during the IranIraqWar, Iran received a great deal of weapons and aid from Israel, because both countries considered Saddam Hussein a far greater enemy (Hussein in fact disseminated a notorious pamphlet written by his father-in-law titled "[[http://en.wikipedia.org/wiki/Three_Whom_God_Should_Not_Have_Created:_Persians,_Jews,_and_Flies Three Whom God Should Not Have Created: Persians, Jews, and Flies]]"). Historian Trita Parsi has also claimed that Israel's bombing of Iraq's nuclear facility at Osirak was assisted by Iranian intelligence, but Iran officially denies this.
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* The Iranian Revolution brought together (for a brief period of time) leftists, communists communists, and fundamental Islamists.
** Also during theIranIraqWar, {{Iran-Iraq War}}, Iran received a great deal of weapons and aid from Israel, because both countries considered Saddam Hussein SaddamHussein a far greater enemy (Hussein in fact disseminated a notorious pamphlet written by his father-in-law titled "[[http://en.wikipedia.org/wiki/Three_Whom_God_Should_Not_Have_Created:_Persians,_Jews,_and_Flies Three Whom God Should Not Have Created: Persians, Jews, and Flies]]"). Historian Trita Parsi has also claimed that Israel's bombing of Iraq's nuclear facility at Osirak was assisted by Iranian intelligence, but Iran officially denies this.
** Also during the
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** Similarly in 1824, JohnQuincyAdams and Henry Clay against AndrewJackson.
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** Similarly in 1824, JohnQuincyAdams and Henry Clay HenryClay against AndrewJackson.
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* American Censorship Day had a bit of this. In particular, groups like Wiki/{{Wikipedia}}, Mozilla, Reddit, and Google were fighting alongside ''4chan'' for a common cause (though this may be more of a RivalsTeamUp; nobody particularly ''likes'' 4chan, but there's little actual hostility from the mentioned groups). Republican Darrell Issa also posted a tweet noting how both he and Democrat Nancy Pelosi were against SOPA.
** The sites blacked out on that day also ranged from BillOReilly's to MoveOn.org.
* GeorgeTakei recently attempted to reconcile the feud between ''Franchise/StarTrek'' and ''Franchise/StarWars'' {{Fan Boy}}s by encouraging them to unite against a greater evil -- ''Literature/{{Twilight}}'' and it's {{fan|Dumb}}s.
** The sites blacked out on that day also ranged from BillOReilly's to MoveOn.org.
* GeorgeTakei recently attempted to reconcile the feud between ''Franchise/StarTrek'' and ''Franchise/StarWars'' {{Fan Boy}}s by encouraging them to unite against a greater evil -- ''Literature/{{Twilight}}'' and it's {{fan|Dumb}}s.
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* American Censorship Day had a bit of this. In particular, groups like Wiki/{{Wikipedia}}, Mozilla, Reddit, Website/{{Reddit}}, and Google were fighting alongside ''4chan'' for a common cause (though this may be more of a RivalsTeamUp; nobody particularly ''likes'' 4chan, but there's little actual hostility from the mentioned groups). Republican Darrell Issa also posted a tweet noting how both he and Democrat Nancy Pelosi were against SOPA.
** The sites blacked out on that day also ranged fromBillOReilly's [[Series/TheOReillyFactor Bill O'Reilly]]'s to MoveOn.org.
*GeorgeTakei Creator/GeorgeTakei recently attempted to reconcile the feud between ''Franchise/StarTrek'' and ''Franchise/StarWars'' {{Fan Boy}}s by encouraging them to unite against a greater evil -- ''Literature/{{Twilight}}'' and it's {{fan|Dumb}}s.
** The sites blacked out on that day also ranged from
*
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* ElectronicArts essentially has made this happen indirectly for rival gaming communities, as [[ImageBoard 4chan]], {{Reddit}}, Kotaku, and others helped them get declared 2012's [[http://consumerist.com/2012/04/congratulations-ea-you-are-the-worst-company-in-america-for-2012.html Worst Company in America]] by The Consumerist.
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* ElectronicArts essentially has made this happen indirectly for rival gaming communities, as [[ImageBoard [[ImageBoards 4chan]], {{Reddit}}, Website/{{Reddit}}, Kotaku, and others helped them get declared 2012's [[http://consumerist.com/2012/04/congratulations-ea-you-are-the-worst-company-in-america-for-2012.html Worst Company in America]] by The Consumerist.
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* Larry Flint resents Woody Harrelson for his portrayal of him in ''ThePeopleVsLarryFlynt'', but vocally supported him when he intentionally got himself arrested for marijuana possession in protest over the law prohibiting it.
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* Larry Flint resents Woody Harrelson for his portrayal of him in ''ThePeopleVsLarryFlynt'', ''Film/ThePeopleVsLarryFlynt'', but vocally supported him when he intentionally got himself arrested for marijuana possession in protest over the law prohibiting it.
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* Another proverb, which provides the Alt Title for this trope: "War and politics make strange bedfellows." Usually quoted with either war or politics mentioned alone, as appropriate for the situation.
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* Larry Flint resents Woody Harrelson for his portrayal of him in ''ThePeopleVsLarryFlint'', but vocally supported him when he intentionally got himself arrested for marijuana possession in protest over the law prohibiting it.
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* Larry Flint resents Woody Harrelson for his portrayal of him in ''ThePeopleVsLarryFlint'', ''ThePeopleVsLarryFlynt'', but vocally supported him when he intentionally got himself arrested for marijuana possession in protest over the law prohibiting it.
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* Larry Flint resents Woody Harrelson for his portrayal of him in ''ThePeopleVsLarryFlint'', but vocally supported him when he intentionally got himself arrested for marijuana possession in protest over the law prohibiting it.
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** Didn't stop the latter from housing Osama bin Laden, though...
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* In the WarOfTheTripleAlliance, Brazil and Argentina, who had been competing for influence in Uruguay, went to war against Paraguay.
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* In the WarOfTheTripleAlliance, Brazil and Argentina, who had long been competing for influence in Uruguay, antagonistic towards one another, went to war against Paraguay.
Paraguay. They were joined by Uruguay, which was basically their punching bag.
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* In the WarOfTheTripleAlliance, Brazil and Argentina, who had been competing for influence in Uruguay, went to war against Paraguay.
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* During WorldWarOne, the conservative monarchist German government helped the radical VladimirLenin return to Russia so that he could overthrow the government and make peace with the Central Powers.
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* In issues involving the Separation of Church and State in the U.S., atheist groups and religious groups do team up. Some Christians don't like government being linked to their religion, the Jews, Muslims, Buddhists, and other groups don't like Christianity being endorsed by the government, and atheists don't want any religion endorsed by the government. The group Americans United for Separation of Church and State is an example of this. Another good example is the opposition to Amendment 8 in Florida, an amendment to allow the state treasury to be used to support churches and religious institutions. One of the more prominent opposing voices is a Rabbi.
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* The [[TheWarOnTerror September 11 attacks]] brought a few of these out of the woodwork, as governments who aren't exactly known for their fondness of the American government condemned the attacks and the terrorism that caused them. Among these governments? ''North Korea and the Taliban''. (At least officially.)
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* The [[TheWarOnTerror September 11 attacks]] brought a few of these out of the woodwork, as governments who aren't exactly known for their fondness of the American government condemned the attacks and the terrorism that caused them. Among these governments? ''North Korea and the Taliban''. (At least officially.))
* Hunters and animal-rights activists may not always see eye to eye, but they will team up to oppose development projects and save endangered species.
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* Hunters and animal-rights activists may not always see eye to eye, but they will team up to oppose development projects and save endangered species.
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* The proverb is of either ancient Arabic or Chinese origin, but the closest you're going to get to a {{Trope Namer|s}} is Creator/NiccoloMachiavelli, who coined this principle: The neighbour is the natural enemy; hence the neighbour to the neighbour is the natural ally.
* This happened a lot during WorldWarII:
** Mao's Communist forces and Jiang's Guomindang forces called time out and fought the occupying Japanese together. Both sides were frantically trying to ensure the ''other'' side was going to take the majority of casualties.
*** Though, this ended up more around the lines of the Guomindang forces doing most of the work while the Communists [[DirtyCoward avoided most of the fighting]], doing only small scale guerilla warfare, and [[ChronicBackstabbingDisorder occasionally firing upon Guomindang forces, as well]].
** The Soviets and Nazis declared a nonaggression pact, though both considered it merely a stalling action before war broke out. Germany broke the treaty first and attacked.
*** Specifically Germany wanted USSR out of the way so that they could defeat Britain and then attack USSR because they wanted to avoid a two front war. USSR wanted to wait as long as possible so that they could get their factories and army up to full capacity. Obviously Germany never took Britain and attacked USSR before they were entirely ready, thus causing a two sided war.
*** Part of Nazi Party stated policy was to a) destroy the Communist threat to the German state and b) annex, ethnically-cleanse and settle the Slavic lands as part of the ideology of obtaining 'Lebensraum' for ethnic Germans. It is very unlikely that Hitler ever intended to honour the pact.
**** Actually, Stalin knew that. He believed that Germany would eventually invade the USSR. The reason he entered the non-aggression pact was to buy time to prepare for the invasion.
*** There is evidence that at one point Germany offered to let the USSR join the Axis, but the USSR wanted too much in exchange (control of Finland, Turkey, and eventually the Persian Gulf). Plans to invade the USSR were drawn up soon after.
*** In ''Mein Kampf'' Hitler declares his intention to conquer USSR. It appears that the Soviet Union was the only place where it was read.
** The United States, Great Britain, and the Soviet Union worked side by side to defeat Germany, Japan and Italy
** Winston Churchill was a staunch anti-Communist, but he promised help to the Soviet Union immediately after Hitler attacked it. He once said, "If Hitler invaded Hell I would make at least a favorable reference to the devil in the House of Commons."
** Various people classified as sub-humans by the Nazis, such as Japanese, Chechens and Indians, teamed up with the Nazis against a common enemy (the Soviet Union for Chechens, Britain for Indians). Many slavonic people actually served in the Wehrmacht itself.
*** Only the very small number of Indians sided with the Axis, and were generally of little consequence.
*** Also, Hitler considered Chinese and Japanese to be "warrior races" because of their fine recent (well, ancient for China, who Hitler actually preferred to ally with but they couldn't hurt the British as much as Japan) history.
*** Complicated further by Hitler never wanting to go to war with Britain. In fact it's been suggested that he originally wanted an Anglo-German alliance and he initially admired the British for their military and empire-building capability. Had Edward VIII remained on the throne, this could've likely happened, or at least, Hitler thought so, and wondered WhatCouldHaveBeen if he had.
** Infamous American gangster "Lucky" Luciano bargained for his release from prison after claiming that he could protect American wharfs from saboteurs with gangster muscle. Some people suspect that it was actually Luciano's men, if anyone, who were causing the problems in the first place.
*** Luciano also supposedly made available contacts in Sicily to military intelligence during the Italian campaign, a claim that he also later denied. Given that the Fascists intended to wipe the Mafia out, the claim has some credence.
* This tendency was also repeated again in the African countries of Chad and Somalia, when the warring forces teamed up to kick out the foreign invaders. In Chad's case, the government and rebel forces united to fight the invading forces of Libya, while the Somalis temporarily put their civil war on hold to kick out the United Nations force sent to restore order after the collapse of the dictatorship, before they returned to fighting among themselves.
* During the fifth century BC, [[AncientGreece the Spartans and Athenians]] teamed up to fight the Persians.
* Can probably be applied to the vast majority of wars, including the alliances against Napoleon.
** During the ColdWar, this was practically official policy for both sides.
*** In an ideological level [[CallBack Fascism and capitalism]] joined together (or more accurately, [[TheManBehindTheMan Capitalism put in fascism]]) in Latin America against the threat of Communism. An exact opposite of what was viewed in WWII: Communism and Capitalism vs Fascism.
* The [[http://en.wikipedia.org/wiki/Robbers_Cave_Experiment "Robbers' Cave" experiment]]. Two groups of boys at a summer camp were first isolated from each other and encouraged to form a group mentality. After a few days they were introduced to the other group in a competitive environment in order to produce inter-group friction. This stage was ''ended early'' when the hostile rivalry reached potentially dangerous levels. The groups were then given mutual "superordinate goals" forcing them to work together, and the hostility evaporated as quickly as it had appeared.
* [[StrawFeminist Militant feminists]] and [[MoralGuardians conservative Christians]] disagree on almost every issue, with the exception of one: they are both opposed to pornography. The feminists feel that it's exploitative of women, while the Christians feel that it's immoral, sinful, ''and'' exploitative.
** The odd alliance between the Religious Right and militant feminists on the subjects of porn and prostitution has been frequently {{lampshade|Hanging}}d and criticized by more moderate "sex-positive" feminists. There's considerable debate in the feminist camp as to whether or not sex work is exploitative, especially when the participants are fully willing.
** It gets better. A proposal to create a ".xxx" top-level domain for internet porn was recently approved by ICANN, resulting in an alliance between the Religious Right (who fear that it will legitimize pornography) and much of the porn industry (who fear that it will lead to tighter regulation) against it. Alliances don't get much stranger than that.
** Similar to the issue of the ".xxx" top-level domain for internet porn, both the Religious Right and the porn industry are opposed to making it legal for women to go topless. The former believe that it's immoral, while the latter... Well, they feel that it would dramatically decrease business for them -- since there would no longer be a demand for "topless pornography".
*** Except, in several states (including New York) it IS legal for ANYONE to go topless, as long as they don't enter private businesses that request you not to (i.e. the famous "[[DressCode No shirt, no shoes, no service]]" rule).
** Margaret Atwood's ''Literature/TheHandmaidsTale'' has this unusual alliance to blame at least partially to cause the creation of Gilead.
** Similarly, the alliance between militant feminists and the Christian Right in banning the wearing of burqas (as seen in France and Belgium). Militant feminists think burqas oppress women and restrict their rights while the Christian Right tend to cite "fundamentalism" creeping into society. Although burqas are banned in several explicitly Islamic nations already, so it's a bit more complicated than that, and burqa bans create an enemy mine on the other side of the fence: religious Muslims and political liberals (in the "small l" sense of "let people do what they want within reason."
** The list of things these two factions agree on gets longer: both have been critical of [[TheNewRockAndRoll heavy rock music,]] have shown a liking for [[MoralGuardians purging libraries]] of controversial books, both favor harsh 'law and order' stances against sex crimes, lean towards thinking that AllMenArePerverts whom it is woman's duty to [[WomenAreWiser set on the straight and narrow]] and in extreme cases, fully believe that SexIsEvil.
* [[http://www.smithsonianmag.com/history-archaeology/Wayne-B-Wheeler-The-Man-Who-Turned-Off-the-Taps.html?c=y&page=4 It seems]] that the enactment of Prohibition in the US was facilitated by some very strange bedfellows indeed -- Klansmen allied with militant labor unions?
* Islamic and Christian fundamentalists are generally opposed to each other, with the subscribing to different religions and being, well, fundamentalists. However, creationist works and arguments critical of Darwinism tend to pass between both groups, as do tracts critical of homosexuality.
* The ongoing problem of piracy near the coast of Somalia has occasionally forced the naval forces of countries that would otherwise be enemies to invoke this trope by fighting together in skirmishes against the Somali pirates. A notable example of this was seen when the crew of the American USS ''James E. Williams'' fought alongside North Korean sailors to defeat pirates who had captured a North Korean cargo ship in late 2007.
** Not so surprising, as piracy has [[http://en.wikipedia.org/wiki/Hostis_humani_generis long been regarded]] in international law as AlwaysChaoticEvil.
* The Iranian Revolution brought together (for a brief period of time) leftists, communists and fundamental Islamists.
** Also during the IranIraqWar, Iran received a great deal of weapons and aid from Israel, because both countries considered Saddam Hussein a far greater enemy (Hussein in fact disseminated a notorious pamphlet written by his father-in-law titled "[[http://en.wikipedia.org/wiki/Three_Whom_God_Should_Not_Have_Created:_Persians,_Jews,_and_Flies Three Whom God Should Not Have Created: Persians, Jews, and Flies]]"). Historian Trita Parsi has also claimed that Israel's bombing of Iraq's nuclear facility at Osirak was assisted by Iranian intelligence, but Iran officially denies this.
* The [[http://en.wikipedia.org/wiki/2001_uprising_in_Herat 2001 uprising in Herat]] for the US and Iran against the Taliban.
* Though they have yet to actually team up in a war, the Kurds and the Armenians, formerly bitter rivals, actually have somewhat friendly relations now that the Kurds and the Turks are enemies. A representative of the Independent Kurdistan movement even apologized for all Kurdish involvement in the Armenian genocide.
** The best part is that the atrocities were done mainly by ethnic Kurds, not ethnic Turks. Which makes sense, since they live next to each other.
* Combine this trope with ApeShallNeverKillApe and you get the basic idea for TheCrusades.
* During the 1800 election in the United States, AlexanderHamilton and ThomasJefferson both decided that they hated Aaron Burr more than they hated each other, thus leading to Alexander Hamilton persuading the Electoral College to vote for Jefferson instead of Burr.
** Similarly in 1824, JohnQuincyAdams and Henry Clay against AndrewJackson.
* Astonishingly common in US political history, compared to other countries. In fact, both main parties were this during a great deal of their history. To make things further complicated, there often have been alliances between members of opposite parties, which sometimes lead to political realignments. Indeed, both the Whig and the Republican parties were in large part formed by different interests that teamed up in opposition to the policies of the Democratic governments of the day.
* Automotive example: Holden and Toyota teamed up to produce the Holden Commodore VR and the [[http://www.redbook.com.au/used-cars/Toyota/Lexcen/values-model-make.htm Toyota Lexcen]]. However, the Lexcen was not a [[MarketBasedTitle export model]], but solely an Australian version of the Commodore, but without the Commodore's big, brash, American V8 engine, instead only getting a Buick V6 engine. This was created so Toyota had a rival for the Ford Falcon (apparently the 1991-1995 Toyota Camry, incidentally, this was sold as a Holden too, the Holden Apollo being roughly the same size as a BMW 3-Series), a big car, and one of the Asia-Pacific region's biggest sellers. Needless to say, General Motors' (owners of Holden) alliance with Toyota ceased in 2005.
* In 2006, Nigerian President Olusegun Obasanjo tried to change the constitution to allow himself to contest for a third term in office the next year. This led to a feud with his Vice President (and heir-apparent) Atiku Abubakar. To stop the amendment, Atiku teamed up with opposition leader Muhamadu Buhari who was planning a presidential bid as well. They successfully kept Obasanjo out of the race, but their alliance fell apart soon after since neither would step aside for/endorse the other. Obasanjo's new hand-picked successor, Umaru Yar'Adua, won.
** Yar'Adua then proceeded to die in office, leaving the presidency to the UnexpectedSuccessor Goodluck Jonathan, who surprised everybody by actually doing a decent job and getting elected in his own right.
* In a more martial Nigerian example, imprisoned Niger Delta rebels like Isaac Boro were released by the government and admitted into the Federal Army to help thwart the Biafran secession. The Niger Deltans figured being minority ethnicities in a Nigeria with 3 mutually hostile major tribes was more palatable than being minority ethnicities in a Biafra with 1 very dominant tribe, the Ibo.
* This trope has reoccurred on a regular basis throughout Canadian history:
** Confederation itself was begun when the Reformer George Brown offered to serve in a coalition government with the Conservative John A. Macdonald to resolve the political gridlock that had paralyzed the United Province of Canada. Their efforts to solve the problem eventually led to the Confederation agreement that founded Canada.
** The colony of Nova Scotia was bitterly divided over whether to join Confederation or not. The question was eventually resolved when the Irish nationalist Fenians, who were trying to gain political leverage with Great Britain by attacking Canada, began raiding the colony from the United States. The pro- and anti-Confederation movements were forced to team up and eventually joined Canada in no small part due to the need for mutual defence against any American raids.
** On the other side of the continent, British Columbia had to deal with the same question. Along with a pro-Confederation movement, the province also had an anti-Confederation movement that wanted to stay independent and an Annexation movement that wanted to join the U.S. As in Nova Scotia, the pro- and anti-Confederates eventually came together.
** During World War I, Canada was extremely bitterly divided over the issue of conscripting men to fight in the war, to say nothing of even participating in the first place. Prime Minister Robert Borden eventually overcame the Liberal opposition by enticing a number of Liberals to join him in a "Union" government that was a glorified coalition, leaving Wilfrid Laurier with a weakened Liberal rump based mostly in Quebec. Laurier's death in 1917 further crippled the Liberals' attempts to recover.
** In the constitutional debates of the early 1980s, the Quebec separatist Premier Rene Levesque found common cause with seven of the other nine provincial premiers, who came together in opposition to Prime Minister Pierre Trudeau's constitutional reforms. The "Gang of Eight", as it was called, eventually forced Trudeau to put together a compromise that addressed some of their major concerns and eventually became the 1982 constitutional patriation.
* The British General Election of 2010 brought about a coalition government of the right wing Conservative Party and the left wing Liberal Democrats.
** Not so odd if you know a bit more about both parties. The Liberal Democrat free-marketeers (which Clegg represents) and the Conservative liberals (which Cameron represents) have more in common than difference. What has caused problems is that the broader parties don't get on and, given how the middle-class Labour support shifted to the Liberal Democrats during the 2000s, Clegg essentially gambled and is now losing much of his party's newer supporters (and doubtless some of the older ones).
* This happens a lot on Internet debates about religion. Christian fundamentalists, atheists, and New Agers are all opposed to each other, yet in debates on religion, either the atheists will team up with the New Agers against the Christians, (as they think that fundamentalist Christianity is irrational) or the Christians will team up with the New Agers against the atheists (because they believe that atheists are against spirituality). For some reason, the Christians and atheists never team up against the New Age movement...
** The reason, arguably, is that Christians are, generally, fairly ambivalent towards the New Age movement because seems fairly non-threatening and borrows from Christianity (angels, etc), and, while atheists are generally against spirituality, they may feel they have common ground with the new-age movement as its practitioners are also a minority, something that can lead them to see the New Agers as allies, or, at least, as people less opposed to their ideology than mainstream Christianity, which a lot of them [[FoeYay kinda hate]] in a big way.
*** There is room for a Christian-Atheist alliance against new-agers. Both believe in a rule-following, relatively objective universe. But this alliance is very rarely seen.
* The Westboro Baptist Church, aka the "God hates Fags" church, headed by 'Reverend' Fred Phelps, has managed to bring people with differing views together. This isn't difficult seeing as they've managed to piss off ''absolutely everyone''. Most notably they've managed to unite leftists and rightists against them. Leftists oppose the church due to its ''extreme'' anti-homosexuality stance. Rightists are angry at them for their habit of holding protests at the funerals of US troops killed in Iraq and Afghanistan, where they hold picket signs bearing messages such as "God killed your sons", "Thank God for IED's", and "Thank God for dead soldiers".
** The leftists aren't too pleased about those signs praising the deaths of soldiers either. Even the strongest anti-war activists usually don't want soldiers to die. Which makes sense because most antiwar people consider it a waste of valuable human life.
** All the Christians who are against them, [[http://www.youtube.com/watch?v=LQ8U2lX6EE0 many because they aren't against gays]], but there are even quite a few staunchly anti-gay people who, contrary to popular belief, generally don't want gays to be harmed - they just want them to not be gay. The Catholic Church may be against gay sex (they aren't against actual gays, just the sex) but they also run clinics for [=AID=]s sufferers (and sex workers) in countries that want to string gays up by the neck, as well as offering support etc, spoke out on the Ugandan kill-the-gays law.
* National Voluntary Organizations Active in Disaster is a group of a number of organizations that are active in various facets of disaster response. The catch? Many are religious organizations from varying theological perspectives. Catholics respond alongside Protestants. Jews respond with Muslims. So do Hindus, Buddhists and the Scientologists. And- miraculously- it all works out! http://www.nvoad.org/
* The alliance between the Kingdom of France and the Sublime Ottoman Porte; it was one of the first major alliances between a Christian and a Muslim state, directed against the Habsburg Empire.
** And then again between Catholic France and Protestant Sweden during the ThirtyYearsWar; once again to limit the Habsburg power. Cardinal Richelieu practically invented realpolitik. Sweden also was for a short time allied with its ArchEnemy Denmark-Norway during the war...but then Denmark-Norway allied with the Habsburgs in the late part of the war.
* You might not expect Republicans like Ron Paul and the Tea Party movement to have common cause with progressive Democrats, but they've found themselves on the same side in [[http://www.tradereform.org/2011/05/trade-deals-unite-left-and-right-in-opposition/ opposition to free trade deals and continental integration]]. The Tea Party and its supporters see these trade deals as a threat to the sovereignty of the United States and government interference in international trade (many Tea Partiers would prefer to simply have no rules or regulations on trade at all), while their progressive allies see the trade deals as leading to jobs being offshored and labour standards being weakened in America itself.
** The sovereignty issue is a sticking point for many left-wing nationalists in Canada as well. The progressive Council of Canadians has found itself on the same side as right-wing border groups like the American Minutemen, both of whom see continental integration as a threat to their countries' sovereignty.
** Ron Paul and a number of Tea Partiers have also found common ground with the left-wing Occupy Wall Street, particularly over corporate welfare, Wall Street bailouts, foreign wars, and marijuana legalization.
* TheAmericanRevolution was a classic example of this. The revolutionary republican American forces were assisted (arguably decisively) by troops and naval power supplied by France, at the time a very conservative near-absolute monarchy. It was deeply ironic when radical republican ideology crossed the Atlantic a couple of decades later and overthrew that same monarchy.
* Napoleon's regime is an example of this in an ideology. Napoleon was a veteran of the French Republic's military, his government used the republican flag and he claimed to embody the ideals the republic had represented and yet his government was unashamedly an absolute monarchy with Napoleon not shirking even slightly from the trappings of royalism (see, for example, the painting of his coronation).
** It gets even better. To this day, both Bonapartists and legitimists[[hottip:note:Yes, they still exist]] are considered the far right in France, so they are united by their mutual disdain of democracy.
* This trope is one of the reasons DrillSergeantNasty exists. Even if 40 people in a platoon can't agree on ANYTHING else, they can always unite around the fact that the sergeant's an ass.
* In street demonstrations against Israel, the crowd will often include fundamentalist Muslims, anarchists, neo-Nazis, and anti-Zionist Hassidic Jews who believe the Messiah must come before Jews return to Israel.
** Israel supporters also do this. In this case, it's Evangelical Christians teaming up with Right-wing Israelis against the predominately Muslim Palestinians. Ironically, [[http://en.wikipedia.org/wiki/Palestinian_Christians there's a sizable Christian population in the Palestinian Territories]].
* RonaldReagan seemed to be a fan of this trope, and in fact saw it as a potential avenue toward world peace. He once made a speech in which he wondered how much better the world would be if [[AlienInvasion space aliens invaded]], thus forcing the US and [[SovietRussiaUkraineAndSoOn the Soviet Union]] to put aside their differences and fight the threat together. He felt this would remind both sides of their shared humanity, and lead to an end to human conflict. Lest you think he was joking, he actually brought up this scenario in ''several'' speeches, including one to the general assembly of the UnitedNations.
* Music/{{Slayer}}, bane of Religious Conservatives everywhere (at least in the 80's), released a ''pro-life song''. (But see below.)
* Another great example from history is the Catholics and the Protestants for teaming up against the Anabaptists. In the end they took back the city of Munster and then called it a day for their alliance and begin to promptly fight one another again.
* American Censorship Day had a bit of this. In particular, groups like Wiki/{{Wikipedia}}, Mozilla, Reddit, and Google were fighting alongside ''4chan'' for a common cause (though this may be more of a RivalsTeamUp; nobody particularly ''likes'' 4chan, but there's little actual hostility from the mentioned groups). Republican Darrell Issa also posted a tweet noting how both he and Democrat Nancy Pelosi were against SOPA.
** The sites blacked out on that day also ranged from BillOReilly's to MoveOn.org.
* GeorgeTakei recently attempted to reconcile the feud between ''Franchise/StarTrek'' and ''Franchise/StarWars'' {{Fan Boy}}s by encouraging them to unite against a greater evil -- ''Literature/{{Twilight}}'' and it's {{fan|Dumb}}s.
** When ''Twilight'' first came along, every fandom which had ever had rivalry with ''Literature/HarryPotter'' was suddenly allied with the ''Potter'' fans against the ''Twilight'' fans.
* This actually happens quite a bit in music. Some genres (such as Heavy Metal and Rap) will have people who believe that they should put aside all differences and unite against other types such as Pop. Don't believe me? Look on any Website/YouTube music video not relating to Pop music.
* Prominent religious conservatives and liberal disability rights groups have teamed up several times to fight the legalization of assisted suicide. They were also on the same side during the Terri Schiavo debacle.
* Following the passage of Proposition 8 (which outlawed same-sex marriage in California), Several families sued the state on the grounds that the referendum was unconstitutional. The attorneys who teamed up to represent them in court were Theodore Olsen and David Boies, best known for arguing opposing sides of ''Bush v. Gore''. Needless to say, the Defendants [[CurbStompBattle didn't stand a chance.]]
* ElectronicArts essentially has made this happen indirectly for rival gaming communities, as [[ImageBoard 4chan]], {{Reddit}}, Kotaku, and others helped them get declared 2012's [[http://consumerist.com/2012/04/congratulations-ea-you-are-the-worst-company-in-america-for-2012.html Worst Company in America]] by The Consumerist.
* The pro-life movement includes numerous groups arguing from different angles, many of whom wouldn't usually agree with the religious conservatives traditionally associated with the movement. Staunch atheists, self-styled liberals, American Democrats and feminists of various kinds have all been known to team up with them.
* Jane Hamsher, creator of the liberal blog Firedoglake and Grover Norquist, conservative kingmaker, teamed up in 2010 to oppose the Affordable Healthcare Act. The conservative argument was that it was big-government socialism, while liberals believed that it didn't go far enough.
* The [[TheWarOnTerror September 11 attacks]] brought a few of these out of the woodwork, as governments who aren't exactly known for their fondness of the American government condemned the attacks and the terrorism that caused them. Among these governments? ''North Korea and the Taliban''. (At least officially.)
* This happened a lot during WorldWarII:
** Mao's Communist forces and Jiang's Guomindang forces called time out and fought the occupying Japanese together. Both sides were frantically trying to ensure the ''other'' side was going to take the majority of casualties.
*** Though, this ended up more around the lines of the Guomindang forces doing most of the work while the Communists [[DirtyCoward avoided most of the fighting]], doing only small scale guerilla warfare, and [[ChronicBackstabbingDisorder occasionally firing upon Guomindang forces, as well]].
** The Soviets and Nazis declared a nonaggression pact, though both considered it merely a stalling action before war broke out. Germany broke the treaty first and attacked.
*** Specifically Germany wanted USSR out of the way so that they could defeat Britain and then attack USSR because they wanted to avoid a two front war. USSR wanted to wait as long as possible so that they could get their factories and army up to full capacity. Obviously Germany never took Britain and attacked USSR before they were entirely ready, thus causing a two sided war.
*** Part of Nazi Party stated policy was to a) destroy the Communist threat to the German state and b) annex, ethnically-cleanse and settle the Slavic lands as part of the ideology of obtaining 'Lebensraum' for ethnic Germans. It is very unlikely that Hitler ever intended to honour the pact.
**** Actually, Stalin knew that. He believed that Germany would eventually invade the USSR. The reason he entered the non-aggression pact was to buy time to prepare for the invasion.
*** There is evidence that at one point Germany offered to let the USSR join the Axis, but the USSR wanted too much in exchange (control of Finland, Turkey, and eventually the Persian Gulf). Plans to invade the USSR were drawn up soon after.
*** In ''Mein Kampf'' Hitler declares his intention to conquer USSR. It appears that the Soviet Union was the only place where it was read.
** The United States, Great Britain, and the Soviet Union worked side by side to defeat Germany, Japan and Italy
** Winston Churchill was a staunch anti-Communist, but he promised help to the Soviet Union immediately after Hitler attacked it. He once said, "If Hitler invaded Hell I would make at least a favorable reference to the devil in the House of Commons."
** Various people classified as sub-humans by the Nazis, such as Japanese, Chechens and Indians, teamed up with the Nazis against a common enemy (the Soviet Union for Chechens, Britain for Indians). Many slavonic people actually served in the Wehrmacht itself.
*** Only the very small number of Indians sided with the Axis, and were generally of little consequence.
*** Also, Hitler considered Chinese and Japanese to be "warrior races" because of their fine recent (well, ancient for China, who Hitler actually preferred to ally with but they couldn't hurt the British as much as Japan) history.
*** Complicated further by Hitler never wanting to go to war with Britain. In fact it's been suggested that he originally wanted an Anglo-German alliance and he initially admired the British for their military and empire-building capability. Had Edward VIII remained on the throne, this could've likely happened, or at least, Hitler thought so, and wondered WhatCouldHaveBeen if he had.
** Infamous American gangster "Lucky" Luciano bargained for his release from prison after claiming that he could protect American wharfs from saboteurs with gangster muscle. Some people suspect that it was actually Luciano's men, if anyone, who were causing the problems in the first place.
*** Luciano also supposedly made available contacts in Sicily to military intelligence during the Italian campaign, a claim that he also later denied. Given that the Fascists intended to wipe the Mafia out, the claim has some credence.
* This tendency was also repeated again in the African countries of Chad and Somalia, when the warring forces teamed up to kick out the foreign invaders. In Chad's case, the government and rebel forces united to fight the invading forces of Libya, while the Somalis temporarily put their civil war on hold to kick out the United Nations force sent to restore order after the collapse of the dictatorship, before they returned to fighting among themselves.
* During the fifth century BC, [[AncientGreece the Spartans and Athenians]] teamed up to fight the Persians.
* Can probably be applied to the vast majority of wars, including the alliances against Napoleon.
** During the ColdWar, this was practically official policy for both sides.
*** In an ideological level [[CallBack Fascism and capitalism]] joined together (or more accurately, [[TheManBehindTheMan Capitalism put in fascism]]) in Latin America against the threat of Communism. An exact opposite of what was viewed in WWII: Communism and Capitalism vs Fascism.
* The [[http://en.wikipedia.org/wiki/Robbers_Cave_Experiment "Robbers' Cave" experiment]]. Two groups of boys at a summer camp were first isolated from each other and encouraged to form a group mentality. After a few days they were introduced to the other group in a competitive environment in order to produce inter-group friction. This stage was ''ended early'' when the hostile rivalry reached potentially dangerous levels. The groups were then given mutual "superordinate goals" forcing them to work together, and the hostility evaporated as quickly as it had appeared.
* [[StrawFeminist Militant feminists]] and [[MoralGuardians conservative Christians]] disagree on almost every issue, with the exception of one: they are both opposed to pornography. The feminists feel that it's exploitative of women, while the Christians feel that it's immoral, sinful, ''and'' exploitative.
** The odd alliance between the Religious Right and militant feminists on the subjects of porn and prostitution has been frequently {{lampshade|Hanging}}d and criticized by more moderate "sex-positive" feminists. There's considerable debate in the feminist camp as to whether or not sex work is exploitative, especially when the participants are fully willing.
** It gets better. A proposal to create a ".xxx" top-level domain for internet porn was recently approved by ICANN, resulting in an alliance between the Religious Right (who fear that it will legitimize pornography) and much of the porn industry (who fear that it will lead to tighter regulation) against it. Alliances don't get much stranger than that.
** Similar to the issue of the ".xxx" top-level domain for internet porn, both the Religious Right and the porn industry are opposed to making it legal for women to go topless. The former believe that it's immoral, while the latter... Well, they feel that it would dramatically decrease business for them -- since there would no longer be a demand for "topless pornography".
*** Except, in several states (including New York) it IS legal for ANYONE to go topless, as long as they don't enter private businesses that request you not to (i.e. the famous "[[DressCode No shirt, no shoes, no service]]" rule).
** Margaret Atwood's ''Literature/TheHandmaidsTale'' has this unusual alliance to blame at least partially to cause the creation of Gilead.
** Similarly, the alliance between militant feminists and the Christian Right in banning the wearing of burqas (as seen in France and Belgium). Militant feminists think burqas oppress women and restrict their rights while the Christian Right tend to cite "fundamentalism" creeping into society. Although burqas are banned in several explicitly Islamic nations already, so it's a bit more complicated than that, and burqa bans create an enemy mine on the other side of the fence: religious Muslims and political liberals (in the "small l" sense of "let people do what they want within reason."
** The list of things these two factions agree on gets longer: both have been critical of [[TheNewRockAndRoll heavy rock music,]] have shown a liking for [[MoralGuardians purging libraries]] of controversial books, both favor harsh 'law and order' stances against sex crimes, lean towards thinking that AllMenArePerverts whom it is woman's duty to [[WomenAreWiser set on the straight and narrow]] and in extreme cases, fully believe that SexIsEvil.
* [[http://www.smithsonianmag.com/history-archaeology/Wayne-B-Wheeler-The-Man-Who-Turned-Off-the-Taps.html?c=y&page=4 It seems]] that the enactment of Prohibition in the US was facilitated by some very strange bedfellows indeed -- Klansmen allied with militant labor unions?
* Islamic and Christian fundamentalists are generally opposed to each other, with the subscribing to different religions and being, well, fundamentalists. However, creationist works and arguments critical of Darwinism tend to pass between both groups, as do tracts critical of homosexuality.
* The ongoing problem of piracy near the coast of Somalia has occasionally forced the naval forces of countries that would otherwise be enemies to invoke this trope by fighting together in skirmishes against the Somali pirates. A notable example of this was seen when the crew of the American USS ''James E. Williams'' fought alongside North Korean sailors to defeat pirates who had captured a North Korean cargo ship in late 2007.
** Not so surprising, as piracy has [[http://en.wikipedia.org/wiki/Hostis_humani_generis long been regarded]] in international law as AlwaysChaoticEvil.
* The Iranian Revolution brought together (for a brief period of time) leftists, communists and fundamental Islamists.
** Also during the IranIraqWar, Iran received a great deal of weapons and aid from Israel, because both countries considered Saddam Hussein a far greater enemy (Hussein in fact disseminated a notorious pamphlet written by his father-in-law titled "[[http://en.wikipedia.org/wiki/Three_Whom_God_Should_Not_Have_Created:_Persians,_Jews,_and_Flies Three Whom God Should Not Have Created: Persians, Jews, and Flies]]"). Historian Trita Parsi has also claimed that Israel's bombing of Iraq's nuclear facility at Osirak was assisted by Iranian intelligence, but Iran officially denies this.
* The [[http://en.wikipedia.org/wiki/2001_uprising_in_Herat 2001 uprising in Herat]] for the US and Iran against the Taliban.
* Though they have yet to actually team up in a war, the Kurds and the Armenians, formerly bitter rivals, actually have somewhat friendly relations now that the Kurds and the Turks are enemies. A representative of the Independent Kurdistan movement even apologized for all Kurdish involvement in the Armenian genocide.
** The best part is that the atrocities were done mainly by ethnic Kurds, not ethnic Turks. Which makes sense, since they live next to each other.
* Combine this trope with ApeShallNeverKillApe and you get the basic idea for TheCrusades.
* During the 1800 election in the United States, AlexanderHamilton and ThomasJefferson both decided that they hated Aaron Burr more than they hated each other, thus leading to Alexander Hamilton persuading the Electoral College to vote for Jefferson instead of Burr.
** Similarly in 1824, JohnQuincyAdams and Henry Clay against AndrewJackson.
* Astonishingly common in US political history, compared to other countries. In fact, both main parties were this during a great deal of their history. To make things further complicated, there often have been alliances between members of opposite parties, which sometimes lead to political realignments. Indeed, both the Whig and the Republican parties were in large part formed by different interests that teamed up in opposition to the policies of the Democratic governments of the day.
* Automotive example: Holden and Toyota teamed up to produce the Holden Commodore VR and the [[http://www.redbook.com.au/used-cars/Toyota/Lexcen/values-model-make.htm Toyota Lexcen]]. However, the Lexcen was not a [[MarketBasedTitle export model]], but solely an Australian version of the Commodore, but without the Commodore's big, brash, American V8 engine, instead only getting a Buick V6 engine. This was created so Toyota had a rival for the Ford Falcon (apparently the 1991-1995 Toyota Camry, incidentally, this was sold as a Holden too, the Holden Apollo being roughly the same size as a BMW 3-Series), a big car, and one of the Asia-Pacific region's biggest sellers. Needless to say, General Motors' (owners of Holden) alliance with Toyota ceased in 2005.
* In 2006, Nigerian President Olusegun Obasanjo tried to change the constitution to allow himself to contest for a third term in office the next year. This led to a feud with his Vice President (and heir-apparent) Atiku Abubakar. To stop the amendment, Atiku teamed up with opposition leader Muhamadu Buhari who was planning a presidential bid as well. They successfully kept Obasanjo out of the race, but their alliance fell apart soon after since neither would step aside for/endorse the other. Obasanjo's new hand-picked successor, Umaru Yar'Adua, won.
** Yar'Adua then proceeded to die in office, leaving the presidency to the UnexpectedSuccessor Goodluck Jonathan, who surprised everybody by actually doing a decent job and getting elected in his own right.
* In a more martial Nigerian example, imprisoned Niger Delta rebels like Isaac Boro were released by the government and admitted into the Federal Army to help thwart the Biafran secession. The Niger Deltans figured being minority ethnicities in a Nigeria with 3 mutually hostile major tribes was more palatable than being minority ethnicities in a Biafra with 1 very dominant tribe, the Ibo.
* This trope has reoccurred on a regular basis throughout Canadian history:
** Confederation itself was begun when the Reformer George Brown offered to serve in a coalition government with the Conservative John A. Macdonald to resolve the political gridlock that had paralyzed the United Province of Canada. Their efforts to solve the problem eventually led to the Confederation agreement that founded Canada.
** The colony of Nova Scotia was bitterly divided over whether to join Confederation or not. The question was eventually resolved when the Irish nationalist Fenians, who were trying to gain political leverage with Great Britain by attacking Canada, began raiding the colony from the United States. The pro- and anti-Confederation movements were forced to team up and eventually joined Canada in no small part due to the need for mutual defence against any American raids.
** On the other side of the continent, British Columbia had to deal with the same question. Along with a pro-Confederation movement, the province also had an anti-Confederation movement that wanted to stay independent and an Annexation movement that wanted to join the U.S. As in Nova Scotia, the pro- and anti-Confederates eventually came together.
** During World War I, Canada was extremely bitterly divided over the issue of conscripting men to fight in the war, to say nothing of even participating in the first place. Prime Minister Robert Borden eventually overcame the Liberal opposition by enticing a number of Liberals to join him in a "Union" government that was a glorified coalition, leaving Wilfrid Laurier with a weakened Liberal rump based mostly in Quebec. Laurier's death in 1917 further crippled the Liberals' attempts to recover.
** In the constitutional debates of the early 1980s, the Quebec separatist Premier Rene Levesque found common cause with seven of the other nine provincial premiers, who came together in opposition to Prime Minister Pierre Trudeau's constitutional reforms. The "Gang of Eight", as it was called, eventually forced Trudeau to put together a compromise that addressed some of their major concerns and eventually became the 1982 constitutional patriation.
* The British General Election of 2010 brought about a coalition government of the right wing Conservative Party and the left wing Liberal Democrats.
** Not so odd if you know a bit more about both parties. The Liberal Democrat free-marketeers (which Clegg represents) and the Conservative liberals (which Cameron represents) have more in common than difference. What has caused problems is that the broader parties don't get on and, given how the middle-class Labour support shifted to the Liberal Democrats during the 2000s, Clegg essentially gambled and is now losing much of his party's newer supporters (and doubtless some of the older ones).
* This happens a lot on Internet debates about religion. Christian fundamentalists, atheists, and New Agers are all opposed to each other, yet in debates on religion, either the atheists will team up with the New Agers against the Christians, (as they think that fundamentalist Christianity is irrational) or the Christians will team up with the New Agers against the atheists (because they believe that atheists are against spirituality). For some reason, the Christians and atheists never team up against the New Age movement...
** The reason, arguably, is that Christians are, generally, fairly ambivalent towards the New Age movement because seems fairly non-threatening and borrows from Christianity (angels, etc), and, while atheists are generally against spirituality, they may feel they have common ground with the new-age movement as its practitioners are also a minority, something that can lead them to see the New Agers as allies, or, at least, as people less opposed to their ideology than mainstream Christianity, which a lot of them [[FoeYay kinda hate]] in a big way.
*** There is room for a Christian-Atheist alliance against new-agers. Both believe in a rule-following, relatively objective universe. But this alliance is very rarely seen.
* The Westboro Baptist Church, aka the "God hates Fags" church, headed by 'Reverend' Fred Phelps, has managed to bring people with differing views together. This isn't difficult seeing as they've managed to piss off ''absolutely everyone''. Most notably they've managed to unite leftists and rightists against them. Leftists oppose the church due to its ''extreme'' anti-homosexuality stance. Rightists are angry at them for their habit of holding protests at the funerals of US troops killed in Iraq and Afghanistan, where they hold picket signs bearing messages such as "God killed your sons", "Thank God for IED's", and "Thank God for dead soldiers".
** The leftists aren't too pleased about those signs praising the deaths of soldiers either. Even the strongest anti-war activists usually don't want soldiers to die. Which makes sense because most antiwar people consider it a waste of valuable human life.
** All the Christians who are against them, [[http://www.youtube.com/watch?v=LQ8U2lX6EE0 many because they aren't against gays]], but there are even quite a few staunchly anti-gay people who, contrary to popular belief, generally don't want gays to be harmed - they just want them to not be gay. The Catholic Church may be against gay sex (they aren't against actual gays, just the sex) but they also run clinics for [=AID=]s sufferers (and sex workers) in countries that want to string gays up by the neck, as well as offering support etc, spoke out on the Ugandan kill-the-gays law.
* National Voluntary Organizations Active in Disaster is a group of a number of organizations that are active in various facets of disaster response. The catch? Many are religious organizations from varying theological perspectives. Catholics respond alongside Protestants. Jews respond with Muslims. So do Hindus, Buddhists and the Scientologists. And- miraculously- it all works out! http://www.nvoad.org/
* The alliance between the Kingdom of France and the Sublime Ottoman Porte; it was one of the first major alliances between a Christian and a Muslim state, directed against the Habsburg Empire.
** And then again between Catholic France and Protestant Sweden during the ThirtyYearsWar; once again to limit the Habsburg power. Cardinal Richelieu practically invented realpolitik. Sweden also was for a short time allied with its ArchEnemy Denmark-Norway during the war...but then Denmark-Norway allied with the Habsburgs in the late part of the war.
* You might not expect Republicans like Ron Paul and the Tea Party movement to have common cause with progressive Democrats, but they've found themselves on the same side in [[http://www.tradereform.org/2011/05/trade-deals-unite-left-and-right-in-opposition/ opposition to free trade deals and continental integration]]. The Tea Party and its supporters see these trade deals as a threat to the sovereignty of the United States and government interference in international trade (many Tea Partiers would prefer to simply have no rules or regulations on trade at all), while their progressive allies see the trade deals as leading to jobs being offshored and labour standards being weakened in America itself.
** The sovereignty issue is a sticking point for many left-wing nationalists in Canada as well. The progressive Council of Canadians has found itself on the same side as right-wing border groups like the American Minutemen, both of whom see continental integration as a threat to their countries' sovereignty.
** Ron Paul and a number of Tea Partiers have also found common ground with the left-wing Occupy Wall Street, particularly over corporate welfare, Wall Street bailouts, foreign wars, and marijuana legalization.
* TheAmericanRevolution was a classic example of this. The revolutionary republican American forces were assisted (arguably decisively) by troops and naval power supplied by France, at the time a very conservative near-absolute monarchy. It was deeply ironic when radical republican ideology crossed the Atlantic a couple of decades later and overthrew that same monarchy.
* Napoleon's regime is an example of this in an ideology. Napoleon was a veteran of the French Republic's military, his government used the republican flag and he claimed to embody the ideals the republic had represented and yet his government was unashamedly an absolute monarchy with Napoleon not shirking even slightly from the trappings of royalism (see, for example, the painting of his coronation).
** It gets even better. To this day, both Bonapartists and legitimists[[hottip:note:Yes, they still exist]] are considered the far right in France, so they are united by their mutual disdain of democracy.
* This trope is one of the reasons DrillSergeantNasty exists. Even if 40 people in a platoon can't agree on ANYTHING else, they can always unite around the fact that the sergeant's an ass.
* In street demonstrations against Israel, the crowd will often include fundamentalist Muslims, anarchists, neo-Nazis, and anti-Zionist Hassidic Jews who believe the Messiah must come before Jews return to Israel.
** Israel supporters also do this. In this case, it's Evangelical Christians teaming up with Right-wing Israelis against the predominately Muslim Palestinians. Ironically, [[http://en.wikipedia.org/wiki/Palestinian_Christians there's a sizable Christian population in the Palestinian Territories]].
* RonaldReagan seemed to be a fan of this trope, and in fact saw it as a potential avenue toward world peace. He once made a speech in which he wondered how much better the world would be if [[AlienInvasion space aliens invaded]], thus forcing the US and [[SovietRussiaUkraineAndSoOn the Soviet Union]] to put aside their differences and fight the threat together. He felt this would remind both sides of their shared humanity, and lead to an end to human conflict. Lest you think he was joking, he actually brought up this scenario in ''several'' speeches, including one to the general assembly of the UnitedNations.
* Music/{{Slayer}}, bane of Religious Conservatives everywhere (at least in the 80's), released a ''pro-life song''. (But see below.)
* Another great example from history is the Catholics and the Protestants for teaming up against the Anabaptists. In the end they took back the city of Munster and then called it a day for their alliance and begin to promptly fight one another again.
* American Censorship Day had a bit of this. In particular, groups like Wiki/{{Wikipedia}}, Mozilla, Reddit, and Google were fighting alongside ''4chan'' for a common cause (though this may be more of a RivalsTeamUp; nobody particularly ''likes'' 4chan, but there's little actual hostility from the mentioned groups). Republican Darrell Issa also posted a tweet noting how both he and Democrat Nancy Pelosi were against SOPA.
** The sites blacked out on that day also ranged from BillOReilly's to MoveOn.org.
* GeorgeTakei recently attempted to reconcile the feud between ''Franchise/StarTrek'' and ''Franchise/StarWars'' {{Fan Boy}}s by encouraging them to unite against a greater evil -- ''Literature/{{Twilight}}'' and it's {{fan|Dumb}}s.
** When ''Twilight'' first came along, every fandom which had ever had rivalry with ''Literature/HarryPotter'' was suddenly allied with the ''Potter'' fans against the ''Twilight'' fans.
* This actually happens quite a bit in music. Some genres (such as Heavy Metal and Rap) will have people who believe that they should put aside all differences and unite against other types such as Pop. Don't believe me? Look on any Website/YouTube music video not relating to Pop music.
* Prominent religious conservatives and liberal disability rights groups have teamed up several times to fight the legalization of assisted suicide. They were also on the same side during the Terri Schiavo debacle.
* Following the passage of Proposition 8 (which outlawed same-sex marriage in California), Several families sued the state on the grounds that the referendum was unconstitutional. The attorneys who teamed up to represent them in court were Theodore Olsen and David Boies, best known for arguing opposing sides of ''Bush v. Gore''. Needless to say, the Defendants [[CurbStompBattle didn't stand a chance.]]
* ElectronicArts essentially has made this happen indirectly for rival gaming communities, as [[ImageBoard 4chan]], {{Reddit}}, Kotaku, and others helped them get declared 2012's [[http://consumerist.com/2012/04/congratulations-ea-you-are-the-worst-company-in-america-for-2012.html Worst Company in America]] by The Consumerist.
* The pro-life movement includes numerous groups arguing from different angles, many of whom wouldn't usually agree with the religious conservatives traditionally associated with the movement. Staunch atheists, self-styled liberals, American Democrats and feminists of various kinds have all been known to team up with them.
* Jane Hamsher, creator of the liberal blog Firedoglake and Grover Norquist, conservative kingmaker, teamed up in 2010 to oppose the Affordable Healthcare Act. The conservative argument was that it was big-government socialism, while liberals believed that it didn't go far enough.
* The [[TheWarOnTerror September 11 attacks]] brought a few of these out of the woodwork, as governments who aren't exactly known for their fondness of the American government condemned the attacks and the terrorism that caused them. Among these governments? ''North Korea and the Taliban''. (At least officially.)
