History Main / YouAlreadyChangedThePast

25th Aug '16 4:50:01 AM ChipGoffOfROR
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* ''Film/AliceThroughTheLookingGlass'' carries the message that while changing the past in Underland is impossible, you might be able to learn from it. Alice discovers this the hard way when she tries to [[spoiler: prevent the childhood accident that caused the Red Queen's giant deformed head. Originally Iracebeth hit her head on a grandfather clock that was being carried across the street, but when Alice manages to knock the clock out of the way young Iracebeth ends up tripping and smacking her head on a stone ledge anyway.]]
6th Aug '16 10:55:47 AM MarkLungo
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--->'''Claire Young''': ''[rubbing her pregnant belly]'' That's a beautiful name though. "Allison"...

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--->'''Claire -->'''Claire Young''': ''[rubbing her pregnant belly]'' That's a beautiful name though. "Allison"...
6th Aug '16 10:55:06 AM MarkLungo
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* In ''Series/TheTwilightZone'' episode "[[Recap/TheTwilightZone1985S1E20AProfileInSilver Profile in Silver]]", a time travelling historian saves his ancestor UsefulNotes/JohnFKennedy from being assassinated. The resulting damage to space time then creates a timeline where WorldWarIII and the extinction of humanity is inevitable. Kennedy volunteers to go back to set things right but the historian instead sends Kennedy to the future and takes Kennedy's place in the motorcade, being assassinated in his place. A colleague of the historian then tells the Secret Service agent who helped him that "Even the act of traveling in time is part of history" and that the historian's sacrifice was part of the "correct" timeline.

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* In ''Series/TheTwilightZone'' ''Series/TheTwilightZone1985'' episode "[[Recap/TheTwilightZone1985S1E20AProfileInSilver Profile in Silver]]", a time travelling historian saves his ancestor UsefulNotes/JohnFKennedy from being assassinated. The resulting damage to space time then creates a timeline where WorldWarIII and the extinction of humanity is inevitable. Kennedy volunteers to go back to set things right but the historian instead sends Kennedy to the future and takes Kennedy's place in the motorcade, being assassinated in his place. A colleague of the historian then tells the Secret Service agent who helped him that "Even the act of traveling in time is part of history" and that the historian's sacrifice was part of the "correct" timeline.
11th Jul '16 3:41:40 AM nighttrainfm
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* In ''ComicBook/TheTransformersMoreThanMeetsTheEye'', Brainstorm intends to prevent the war by killing Megatron - his crewmates think he intends to win the war by killing Optimus, which is why they follow. Brainstorm's time travel causes the evacuation on a mining asteroid which resulted in Megatron making his first kill, then he leads the others back where ''they'' are the cause of the brawl Megatron was arrested in (and also get to see that before Whirl got his claws on him, he was a total pussy). Meanwhile Chromedome prevents Rewind from changing the future by saying "We're not allowed to change the future" even though they could have, but seconds later blurts out this will be Senator Shockwave's location in a year's time - which also keeps the future from changing.

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* In ''ComicBook/TheTransformersMoreThanMeetsTheEye'', Brainstorm intends to prevent the war by killing Megatron - his crewmates think he intends to win the war by killing Optimus, which is why they follow. Brainstorm's time travel causes the evacuation on a mining asteroid which resulted in Megatron making his first kill, then he leads the others back to where ''they'' are the cause of the brawl Megatron was arrested in (and also get in, leading to see that before Whirl got his claws on him, he was a total pussy). Meanwhile beating him up and demonstrating the power of violence. Meanwhile, Chromedome prevents Rewind from changing the future by saying "We're not allowed to change the future" even though they could have, but seconds later blurts out this will be Senator Shockwave's location in a year's time - which also keeps the future from changing.
11th Jul '16 3:40:12 AM nighttrainfm
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** Played with again in the finale. [[spoiler:Dinobot II, being influenced by the original Dinobot's spirit]] sends the Maximals information concerning an Autobot shuttle docked in the Ark. Black Arachnia points out that the historical records never mentioned that the Autobots had a shuttle. Rhinox then exclaims that history is still being made, and uses the...

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** Played with again in the finale. [[spoiler:Dinobot II, being influenced by the original Dinobot's spirit]] sends the Maximals information concerning an Autobot shuttle docked in the Ark. Black Arachnia Blackarachnia points out that the historical records never mentioned that the Autobots had a shuttle. Rhinox then exclaims that history is still being made, and uses the...the shuttle to save the day and take everyone home.
8th Jul '16 9:25:46 AM jjnonken
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This trope ''arguably'' makes the most sense when considering time travel from a scientific point of view, see the [[http://en.wikipedia.org/wiki/Novikov_self-consistency_principle Novikov self-consistency principle]].[[note]]Novikov's self-consistency principle was named "the Law of Conservation of History" by Creator/LarryNiven in his short piece "The Theory and Practice of Time Travel," published at least ten years prior to Novikov's work. Of course, Larry Niven is a ScienceFiction writer, which may explain why nobody cares. Alternatively, this is an illustration of something called [[http://en.wikipedia.org/wiki/Stigler%27s_law_of_eponymy Stigler's Law of Eponymy: nothing ever gets named after the first person to discover it.]][[/note]] However, the number of time-travel plots that it allows for are extremely limited and the logic gets complicated ''very'' quickly. This, however, also has the side-effect of creating a '[[FunctionalMagic self-correcting universe]]' usually by a slew of {{Contrived Coincidence}}s (e.g. if you try to shoot your grandfather the gun will jam; if you try poisoning him he will recover; if you try strangling him you will be overcame; if you wear PowerArmor from the future you will have second thoughts; if you try sending a bomb back through time and detonating it directly inside his chest the time machine will break down). This can also lead to a scenario where the ''only'' reason why the past is not changed is because someone else says 'you cannot' and you take his advice. Meaning ''the advice itself'' is a part of the universe's self-correcting nature.

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This trope ''arguably'' makes the most sense when considering time travel from a scientific point of view, see the [[http://en.wikipedia.org/wiki/Novikov_self-consistency_principle Novikov self-consistency principle]].[[note]]Novikov's self-consistency principle was named "the Law of Conservation of History" by Creator/LarryNiven in his short piece "The Theory and Practice of Time Travel," published at least ten years prior to Novikov's work. Of course, Larry Niven is a ScienceFiction writer, which may explain why nobody cares. Alternatively, this is an illustration of something called [[http://en.wikipedia.org/wiki/Stigler%27s_law_of_eponymy Stigler's Law of Eponymy: nothing ever gets named after the first person to discover it.]][[/note]] However, the number of time-travel plots that it allows for are extremely limited and the logic gets complicated ''very'' quickly. This, however, also has the side-effect of creating a '[[FunctionalMagic self-correcting universe]]' usually by a slew of {{Contrived Coincidence}}s (e.g. if you try to shoot your grandfather the gun will jam; if you try poisoning him he will recover; if you try strangling him you will be overcame; overcome; if you wear PowerArmor from the future you will have second thoughts; if you try sending a bomb back through time and detonating it directly inside his chest the time machine will break down). This can also lead to a scenario where the ''only'' reason why the past is not changed is because someone else says 'you cannot' and you take his advice. Meaning ''the advice itself'' is a part of the universe's self-correcting nature.
7th Jul '16 4:02:31 PM HighCrate
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* ''Series/CrimeTraveller'' had this as a central point, in theory. In practice, ''everything'' about the show's time travel suffered from galloping TheyJustDidntCare.
23rd Jun '16 4:43:20 PM spiritsunami
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* In the second ''[[Literature/{{Animorphs}} Megamorphs]] book, the Animorphs go back to the time of the dinosaurs. While there, they find two groups of aliens at war with one another, the Mercora and the Nesk, and take the Mercora's side. Meanwhile, they're also trying to get back to their own time period, which will apparently require a nuclear explosion, and so they steal a nuke from the Nesk. This causes the Nesk to leave the planet angrily, but not before diverting the path of a comet that was originally going to narrowly miss the Earth so that it crashes into it instead. Most of the Animorphs want to use the nuke to destroy the comet and save the Mercora, but Tobias has Ax sabotage the nuke in a way so that the Mercora won't realize it's a dud until it's too late, [[https://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_extinction_event having realized that the evolution of mammalian life as they now it depends on that comet striking.]]
16th May '16 4:13:55 PM DeisTheAlcano
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* In ''ComicBook/TheTransformersMoreThanMeetsTheEyee'', Brainstorm intends to prevent the war by killing Megatron - his crewmates think he intends to win the war by killing Optimus, which is why they follow. Brainstorm's time travel causes the evacuation on a mining asteroid which resulted in Megatron making his first kill, then he leads the others back where ''they'' are the cause of the brawl Megatron was arrested in (and also get to see that before Whirl got his claws on him, he was a total pussy). Meanwhile Chromedome prevents Rewind from changing the future by saying "We're not allowed to change the future" even though they could have, but seconds later blurts out this will be Senator Shockwave's location in a year's time - which also keeps the future from changing.

to:

* In ''ComicBook/TheTransformersMoreThanMeetsTheEyee'', ''ComicBook/TheTransformersMoreThanMeetsTheEye'', Brainstorm intends to prevent the war by killing Megatron - his crewmates think he intends to win the war by killing Optimus, which is why they follow. Brainstorm's time travel causes the evacuation on a mining asteroid which resulted in Megatron making his first kill, then he leads the others back where ''they'' are the cause of the brawl Megatron was arrested in (and also get to see that before Whirl got his claws on him, he was a total pussy). Meanwhile Chromedome prevents Rewind from changing the future by saying "We're not allowed to change the future" even though they could have, but seconds later blurts out this will be Senator Shockwave's location in a year's time - which also keeps the future from changing.
11th May '16 10:38:54 AM erforce
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* In ''Series/TheSarahConnorChronicles'' episode "Allison from Palmdale", Cameron malfunctions and believes herself to be Allison Young, the resistance fighter on whom her appearance was based. She calls "her" mother, who says this must be some mistake since she doesn't have a daughter "yet"...

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* In ''Series/TheSarahConnorChronicles'' ''Series/TerminatorTheSarahConnorChronicles'' episode "Allison from Palmdale", Cameron malfunctions and believes herself to be Allison Young, the resistance fighter on whom her appearance was based. She calls "her" mother, who says this must be some mistake since she doesn't have a daughter "yet"...
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