History Main / GrandfatherParadox

11th Sep '16 1:16:48 PM nighttrainfm
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** In "Last of the Time Lords", The Master constructs a Paradox Machine specifically to evade the consequences of this paradox, [[spoiler:as his army of psychopathic laser balls happen to be the descendants of humans, from the end of the universe.]]

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** In "Last of the Time Lords", The Master constructs a Paradox Machine specifically to evade the consequences of this paradox, [[spoiler:as his army of psychopathic homicidal laser balls happen to be the descendants of humans, from the end of the universe.]]
31st Aug '16 4:08:56 PM Plactus
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* The ''Series/12Monkeys'' episode "Lullaby" has Cassie create a paradox by going back in time and killing Jones immediately after the death of her daughter, before she could start trying to invent time travel. The result is a GroundhogDayLoop until Cassie (and Cole, who comes back to help) can figure out what needs to happen to preserve the timeline.

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* The ''Series/12Monkeys'' ''Series/TwelveMonkeys'' episode "Lullaby" has Cassie create a paradox by going back in time and killing Jones immediately after the death of her daughter, before she could start trying to invent time travel. The result is a GroundhogDayLoop until Cassie (and Cole, who comes back to help) can figure out what needs to happen to preserve the timeline.
31st Aug '16 4:08:18 PM Plactus
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* The ''Series/12Monkeys'' episode "Lullaby" has Cassie create a paradox by going back in time and killing Jones immediately after the death of her daughter, before she could start trying to invent time travel. The result is a GroundhogDayLoop until Cassie (and Cole, who comes back to help) can figure out what needs to happen to preserve the timeline.
19th Aug '16 12:15:14 AM rmctagg09
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A subtrope of MurderInTheFamily.
5th Aug '16 4:34:12 AM C105
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* Happens literally in René Barjavel novel ''Le Voyageur imprudent'' written in 1943 (hence the first novel to enunciate the grandfather paradox) where the time-traveler (Pierre Saint-Menoux) tries to assassinate Napoleon Bonaparte before his rise to power: [[spoiler:at the last moment, a soldier jumps to take the bullet and save Bonaparte. This soldier is of course the time-traveler ancestor. The time-traveler is then wiped out from existence.]]

to:

* Happens literally in René Barjavel novel ''Le Voyageur imprudent'' (''The imprudent Traveller'') written in 1943 (hence the first novel to enunciate the grandfather paradox) where the time-traveler (Pierre Saint-Menoux) tries to assassinate Napoleon Bonaparte before his rise to power: [[spoiler:at the last moment, a soldier jumps to take the bullet and save Bonaparte. This soldier is of course the time-traveler ancestor. The time-traveler is then wiped out from existence.]]existence]]. There is even an appendix explaining the paradox at length [[spoiler: (including the fact that, for the time-traveller, there is no real ending - he is constantly oscillating between existing and non-existing. The ending of the novel however makes it clear he does not exist any more - his fiancée is celibate, and the man he helped build the time machine in the first place is fruitlessly trying to make it work)]]
1st Aug '16 5:56:50 AM LadyJaneGrey
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* Discussed in an episode of ''WesternAnimation/DarkwingDuck'' where Gosalyn uses Quackerjack's time machine to bring three of DW's ancestors to the present. Darkwing starts to consider the potential consequences, leading to an ExplainExplainOhCrap realization.
31st Jul '16 4:44:30 AM StFan
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[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/grandfather_paradox.jpg]]

->'''Rarity''': How in Equestria is my travelling in time supposed to prove that time travel is impossible?\\
'''Twilight''': I explained this Rarity. Travel back along a given time line can’t be possible, because it could violate causality-—do you know about the ''Grandmother Paradox''?\\
'''Rarity''': No.\\
'''Twilight''': Suppose you travelled back in time to a point before you, and your parents, were born, and you killed your maternal grandmother…\\
'''Rarity''': Why would I ever want to do that? My grandmother is a delightful lady. Even if she does insist on wearing those dreadful frocks with such old fashioned sleeves.\\
'''Twilight''': But hypothetically—-suppose you did-—by accident-—\\
'''Rarity''': I would have trouble-—she’s a tough old mare.\\
'''Twilight''': Yes, but, ''theoretically'' you could do it-—when she was young. But then she would never give birth to your mother, so you would never be born—-so you could never go back in time to kill her-—it’s a paradox-—see!

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[[quoteright:350:http://static.[[quoteright:350:[[Magazine/{{Astronomy}} http://static.tvtropes.org/pmwiki/pub/images/grandfather_paradox.jpg]]

->'''Rarity''':
jpg]]]]

->'''Rarity:'''
How in Equestria is my travelling in time supposed to prove that time travel is impossible?\\
'''Twilight''': '''Twilight:''' I explained this Rarity. Travel back along a given time line can’t can't be possible, because it could violate causality-—do causality -- do you know about the ''Grandmother Paradox''?\\
'''Rarity''': '''Rarity:''' No.\\
'''Twilight''': '''Twilight:''' Suppose you travelled back in time to a point before you, and your parents, were born, and you killed your maternal grandmother…\\
'''Rarity''':
grandmother...\\
'''Rarity:'''
Why would I ever want to do that? My grandmother is a delightful lady. Even if she does insist on wearing those dreadful frocks with such old fashioned sleeves.\\
'''Twilight''': '''Twilight:''' But hypothetically—-suppose hypothetically -- suppose you did-—by accident-—\\
'''Rarity''':
did -- by accident --\\
'''Rarity:'''
I would have trouble-—she’s trouble -- she's a tough old mare.\\
'''Twilight''': '''Twilight:''' Yes, but, ''theoretically'' you could do it-—when it -- when she was young. But then she would never give birth to your mother, so you would never be born—-so born -- so you could never go back in time to kill her-—it’s her -- it's a paradox-—see!paradox -- see!









* Miguel O'Hara from ''Comicbook/SpiderMan2099'' (2014 series) isn't sure exactly what would happen to him if his grandfather Tiberius Stone dies on his watch and he's not eager to find out. This leaves Miguel in the unenviable position of protecting a man he quite rightfully despises.
* [[MadScientist Brainstorm]] built a time machine in ''ComicBook/TransformersMoreThanMeetsTheEye'' that was specifically constructed to be immune to this paradox [[spoiler:so that he could go into the past and kill Megatron before the Great War started]].

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* Miguel O'Hara from ''Comicbook/SpiderMan2099'' ''ComicBook/SpiderMan2099'' (2014 series) isn't sure exactly what would happen to him if his grandfather Tiberius Stone dies on his watch and he's not eager to find out. This leaves Miguel in the unenviable position of protecting a man he quite rightfully despises.
* [[MadScientist Brainstorm]] built a time machine in ''ComicBook/TransformersMoreThanMeetsTheEye'' ''ComicBook/TheTransformersMoreThanMeetsTheEye'' that was specifically constructed to be immune to this paradox [[spoiler:so that he could go into the past and kill Megatron before the Great War started]].



* ''Fanfic/MyFamilyAndOtherEquestrians'': Blade Star has been sent back in time to near the events of the season 2 finale of ''WesternAnimation/MyLittlePonyFriendshipIsMagic'', thanks to a [[Series/DoctorWho Weeping Angel]]. How does he decide to get back? By causing a Grandfather Paradox. If he were to do something at that moment in the past, it would have a ripple effect on his own future, causing everything to change since Blade Star's arrival in Equestria. This would mean that the timeline in which Apple Bloom and Blade Star went to Time Turner's shop and encountered the Weeping Angel would not happen, or at least, happen differently. He would change the past, but therefore have never existed to come back and change the past in the first place. He then concludes that the Weeping Angel itself would become a paradox, as it fed off of something that had no time energy because it didn't exist. In LaymansTerms, he would potentially be brought back to his point of origin, and the angel would be caught in the paradox.\\

to:

* ''Fanfic/MyFamilyAndOtherEquestrians'': Blade Star has been sent back in time to near the events of the season 2 finale of ''WesternAnimation/MyLittlePonyFriendshipIsMagic'', thanks to a [[Series/DoctorWho Weeping Angel]]. How does he decide to get back? By causing a Grandfather Paradox. If he were to do something at that moment in the past, it would have a ripple effect on his own future, causing everything to change since Blade Star's arrival in Equestria. This would mean that the timeline in which Apple Bloom and Blade Star went to Time Turner's shop and encountered the Weeping Angel would not happen, or at least, happen differently. He would change the past, but therefore have never existed to come back and change the past in the first place. He then concludes that the Weeping Angel itself would become a paradox, as it fed off of something that had no time energy because it didn't exist. In LaymansTerms, he would potentially be brought back to his point of origin, and the angel would be caught in the paradox.\\\\\



[[folder:Film]]

* The plot of the first ''Film/BackToTheFuture'' may be the most well known example, even though it's A. not Marty's ''grand''father it involves and B. he doesn't kill him, but rather accidentally [[spoiler:takes his place as his mother's object of affection]]. The rest of the movie has Marty trying to correct things before he's erased from existence.
** Though within the semi-canon/non-canon of the Telltale ''VideoGame/BackToTheFuture'' game, Marty does encounter his paternal grandfather and affects his own existence in time.
* Inverted in ''Film/StargateContinuum'', where Cam Mitchell winds up going back in time, and eventually (ten years down the road) keeping his Grandfather alive as a way of [[SetRightWhatOnceWentWrong setting right what Ba'al had messed up]]. Said paradox was directly referenced before, when Mitchel found out that he doesn't exist in new timeline because Ba'al killed his grandfather.
* The 2002 film version of ''Film/TheTimeMachine2002'' is [[TimeyWimeyBall inconsistent]] in how it deals with this. The first act demonstrates that it is actually impossible to create a paradox; Alexander builds his time machine so he can save his love Emma from dying, but no matter what he does she always ends up dying in one way or another because if she didn't, he wouldn't build the machine and save her. However, the third act throws this out the window when [[spoiler: Alexander travels from 802,701 to even further in the future, discovers that the Morlocks have conquered the Earth, and then goes back to 802,701 to destroy them so that they can't.]] By the first act's logic, it should be impossible for him to do this, since if he's erasing the reason for his own actions, but it works perfectly anyway.

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[[folder:Film]]

[[folder:Films -- Live-Action]]
* The plot of the first ''Film/BackToTheFuture'' may be the most well known well-known example, even though it's A. a) not Marty's ''grand''father it involves and B. b) he doesn't kill him, but rather accidentally [[spoiler:takes his place as his mother's object of affection]]. The rest of the movie has Marty trying to correct things before he's erased from existence.
** Though within the semi-canon/non-canon of the Telltale ''VideoGame/BackToTheFuture'' game, Marty does encounter his paternal grandfather and affects his own existence in time.
* Inverted in ''Film/StargateContinuum'', where Cam Mitchell winds up going back in time, and eventually (ten years down the road) keeping his Grandfather alive as a way of [[SetRightWhatOnceWentWrong setting right what Ba'al had messed up]]. Said paradox was directly referenced before, when Mitchel found out that he doesn't exist in the new timeline because Ba'al killed his grandfather.
* The 2002 film version of ''Film/TheTimeMachine2002'' is [[TimeyWimeyBall inconsistent]] in how it deals with this. The first act demonstrates that it is actually impossible to create a paradox; Alexander builds his time machine so he can save his love Emma from dying, but no matter what he does she always ends up dying in one way or another because if she didn't, he wouldn't build the machine and save her. However, the third act throws this out the window when [[spoiler: Alexander [[spoiler:Alexander travels from 802,701 to even further in the future, discovers that the Morlocks have conquered the Earth, and then goes back to 802,701 to destroy them so that they can't.]] By the first act's logic, it should be impossible for him to do this, since if he's erasing the reason for his own actions, but it works perfectly anyway.



* In ''Literature/{{Discworld}}'', the wizard Rincewind is time-traveling and says that since he's gone back to the beginning of time due to someone using him as a genie wishing to live forever (i.e. beginning to end of time), and he says that he would have to wait around for a while until he could kill his grandfather which is "the only aspect of time travel that really appealed to him".

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* ''Literature/{{Discworld}}'':
**
In ''Literature/{{Discworld}}'', ''Discworld/{{Eric}}'', the wizard Rincewind is time-traveling and says that since he's gone back to the beginning of time due to someone using him as a genie wishing to live forever (i.e. beginning to end of time), and he says that he would have to wait around for a while until he could kill his grandfather which is "the only aspect of time travel that really appealed to him".him".
** Averted in ''Discworld/NightWatch'', where Vimes' mentor is murdered while he's in the past; [[YouWillBeBeethoven he ends up taking over his identity,]] [[StableTimeLoop teaching his younger self everything that his mentor taught him.]]
** Also a DiscussedTrope in ''Discworld/TheLastContinent'' when Ponder Stibbons tries to explain the idea to Archchancellor Ridcully, but runs up against the latter's LiteralMinded {{Metaphorgotten}} tendencies. "Why would I want to kill my grandfather? I rather liked the old boy."



* The Creator/CharlesStross novella ''Palimpsest'' has a twist: killing your own grandfather is the initiation rite for the TimePolice.
** The graduation ceremony is stepping back in time a few minutes and killing ''yourself''.

to:

* The Creator/CharlesStross novella ''Palimpsest'' has a twist: killing your own grandfather is the initiation rite for the TimePolice.
**
TimePolice. The graduation ceremony is stepping back in time a few minutes and killing ''yourself''.



* Averted in ''Discworld/NightWatch'', where Vimes' mentor is murdered while he's in the past; [[YouWillBeBeethoven he ends up taking over his identity,]] [[StableTimeLoop teaching his younger self everything that his mentor taught him.]]
** Also a DiscussedTrope in ''Discworld/TheLastContinent'' when Ponder Stibbons tries to explain the idea to Archchancellor Ridcully, but runs up against the latter's LiteralMinded {{Metaphorgotten}} tendencies. "Why would I want to kill my grandfather? I rather liked the old boy".



* {{Discussed|Trope}} in Creator/StephenKing's ''Literature/ElevenTwentyTwoSixtyThree''.
-->"Yeah, but what if you went back and killed your own grandfather?"\\

to:

* {{Discussed|Trope}} in Creator/StephenKing's ''Literature/ElevenTwentyTwoSixtyThree''.
-->"Yeah,
''Literature/ElevenTwentyTwoSixtyThree''. Though he initially hand-waves, King does answer the question implicitly: nothing would happen to the traveler. People who go through the portal are "out" of the timestream and thus not eliminated as a result of their actions. [[spoiler:Although progressively worse things happen to the traveler the more the traveler tries to make a major change to the timeline, and although the traveler will return to the exact moment of departure, the effects of time spent in the past -- such as aging -- are not reversed.]]
-->''"Yeah,
but what if you went back and killed your own grandfather?"\\



That was a good question, so I just told him to go on.
** Though he initially hand-waves, King does answer the question implicitly: Nothing would happen to the traveler. People who go through the portal are 'out' of the timestream and thus not eliminated as a result of their actions. [[spoiler:Although progressively worse things happen to the traveler the more the traveler tries to make a major change to the timeline, and although the traveler will return to the exact moment of departure, the effects of time spent in the past--such as aging--are not reversed.]]

to:

That was a good question, so I just told him to go on.
** Though he initially hand-waves, King does answer the question implicitly: Nothing would happen to the traveler. People who go through the portal are 'out' of the timestream and thus not eliminated as a result of their actions. [[spoiler:Although progressively worse things happen to the traveler the more the traveler tries to make a major change to the timeline, and although the traveler will return to the exact moment of departure, the effects of time spent in the past--such as aging--are not reversed.]]
on.''



* Happens literally in René Barjavel novel ''Le voyageur imprudent'' written in 1943 (hence the first novel to enunciate the grandfather paradox) where the time-traveler (Pierre Saint-Menoux) tries to assassinate Napoleon Bonaparte before his rise to power: [[spoiler: at the last moment, a soldier jumps to take the bullet and save Bonaparte. This soldier is of course the time-traveler ancestor. The time-traveler is then wiped out from existence.]]

to:

* Happens literally in René Barjavel novel ''Le voyageur Voyageur imprudent'' written in 1943 (hence the first novel to enunciate the grandfather paradox) where the time-traveler (Pierre Saint-Menoux) tries to assassinate Napoleon Bonaparte before his rise to power: [[spoiler: at [[spoiler:at the last moment, a soldier jumps to take the bullet and save Bonaparte. This soldier is of course the time-traveler ancestor. The time-traveler is then wiped out from existence.]]



* ''Franchise/DoctorWhoExpandedUniverse'':
** For the Time Lords, Grandfather Paradox is an actual ''person'' who went back and, yes, killed his grandfather, which doomed him to a sort of undead temporal limbo. He's the Time Lord equivalent of the Bogeyman, and the splinter group/terrorist cult Literature/FactionParadox considers him their spiritual leader, partly cause [[ForTheEvulz it pisses off the Time Lords.]]
** We actually meet him. He's quite literally the AnthropomorphicPersonification of FutureMeScaresMe - he's ''everybody's'' evil future self.
** And Literature/FactionParadox has the entire trope as a sport for initiates. Want to get in? Kill momma. ''[[MindScrew Before you were conceived]]''.
** At one point, his appearance is described as eerily similar to the Ninth Doctor, which at that point would have been the Doctor's future self. In fact, the first time the Doctor encounters a Literature/FactionParadox agent, the agent calls him "Gramps".

to:

* ''Franchise/DoctorWhoExpandedUniverse'':
**
''Franchise/DoctorWhoExpandedUniverse'': For the Time Lords, Grandfather Paradox is an actual ''person'' who went back and, yes, killed his grandfather, which doomed him to a sort of undead temporal limbo. He's the Time Lord equivalent of the Bogeyman, and the splinter group/terrorist cult Literature/FactionParadox considers him their spiritual leader, partly cause [[ForTheEvulz it pisses off the Time Lords.]]
**
]] We actually meet him. He's quite literally the AnthropomorphicPersonification of FutureMeScaresMe - -- he's ''everybody's'' evil future self.
**
self. And Literature/FactionParadox Faction Paradox has the entire trope as a sport for initiates. Want to get in? Kill momma. ''[[MindScrew Before you were conceived]]''.
**
conceived]]''. At one point, his appearance is described as eerily similar to the Ninth Doctor, which at that point would have been the Doctor's future self. In fact, the first time the Doctor encounters a Literature/FactionParadox Faction Paradox agent, the agent calls him "Gramps".



[[folder: Live Action TV ]]

* ''Series/DoctorWho''
** Martha brings this up at the start of her first trip in the TARDIS.
---> "What if I kill my grandfather?"\\
"Are you planning to?"\\
"No."\\
"Well, then."

to:

[[folder: Live Action TV ]]

[[folder:Live-Action TV]]
* ''Series/DoctorWho''
''Series/DoctorWho'':
** Martha Jones brings this up at the start of her first trip in the TARDIS.
---> "What --->'''Martha:''' What if I kill my grandfather?"\\
"Are
grandfather?\\
'''The Doctor:''' Are
you planning to?"\\
"No."\\
"Well,
to?\\
'''Martha:''' No.\\
'''The Doctor:''' Well,
then."



** In the expanded universe, ''Grandfather Paradox'' is the name of a villain of the Time Lords, leader of the Faction Paradox.



* Referenced in ''{{Series/Continuum}}'', when terrorists Liber8 attempt to eliminate their adversary Kiera Cameron- both displaced to 2012 from 2077- by killing her grandmother before she can give birth; Kiera attempts to counter this by threatening the pregnant mother of Liber8's founder. [[spoiler:The paradox is apparently proven irrelevant when the grandmother of Liber8 renegade Matthew Kellog is killed before she has children and nothing happens to him, but Kiera's ally Alec Sadler notes that lack of evidence is not proof that nothing will happen.]]

to:

* Referenced in ''{{Series/Continuum}}'', ''Series/{{Continuum}}'', when terrorists Liber8 attempt to eliminate their adversary Kiera Cameron- both displaced to 2012 from 2077- by killing her grandmother before she can give birth; Kiera attempts to counter this by threatening the pregnant mother of Liber8's founder. [[spoiler:The paradox is apparently proven irrelevant when the grandmother of Liber8 renegade Matthew Kellog is killed before she has children and nothing happens to him, but Kiera's ally Alec Sadler notes that lack of evidence is not proof that nothing will happen.]]



[[folder: Tabletop Games ]]

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[[folder: Tabletop Games ]]
[[folder:Tabletop Games]]



* The ''TabletopGame/{{Warhammer 40000}}'' supplementary material has an Ork warboss who traveled back in time a day and proceeded to kill his past self so he could have two copies of his favorite gun. Unfortunately, this so confused the Orks under his command that the WAAAGH! he was leading fell apart.

to:

* The ''TabletopGame/{{Warhammer 40000}}'' ''TabletopGame/Warhammer40000'' supplementary material has an Ork warboss who traveled back in time a day and proceeded to kill his past self so he could have two copies of his favorite gun. Unfortunately, this so confused the Orks under his command that the WAAAGH! he was leading fell apart.






[[folder: Video Games ]]

to:

[[folder: Video Games ]]
[[folder:Video Games]]
* Within the semi-canon/non-canon of the Telltale ''VideoGame/BackToTheFuture'' game, Marty does encounter his paternal grandfather and affects his own existence in time.



* In [[http://achrongame.com/paradox.html one of the demo videos]] for the [[RealTimeStrategy RTS]] game, ''{{Achron}}'', they build a mech, then send it back in time to destroy the factory that built it.
** The way the game handles this is pretty interesting since it involves "time waves" and a point in the past where time manipulation is impossible. Time waves sweep through the timeline from past to future and, to quote the [[http://www.achrongame.com/wiki/index.php/Main_Page wiki]], "a time wave is what makes the past affect the future". So, when a time wave hits the time the factory was destroyed, the factory simply gets destroyed and the mech survives. When the next time wave hits, the mech will be destroyed because the factory doesn't exist in the future and the factory survives and so on. The "final" version of the event is the one when the event hits the point where time is immutable. [[MindScrew You know what, just watch the video.]]

to:

* In [[http://achrongame.com/paradox.html one of the demo videos]] for the [[RealTimeStrategy RTS]] game, ''{{Achron}}'', ''VideoGame/{{Achron}}'', they build a mech, then send it back in time to destroy the factory that built it.
**
it. The way the game handles this is pretty interesting since it involves "time waves" and a point in the past where time manipulation is impossible. Time waves sweep through the timeline from past to future and, to quote the [[http://www.achrongame.com/wiki/index.php/Main_Page wiki]], "a time wave is what makes the past affect the future". So, when a time wave hits the time the factory was destroyed, the factory simply gets destroyed and the mech survives. When the next time wave hits, the mech will be destroyed because the factory doesn't exist in the future and the factory survives and so on. The "final" version of the event is the one when the event hits the point where time is immutable. [[MindScrew You know what, just watch the video.]]



* In ''Videogame/PokemonMysteryDungeonExplorers Of Time/Darkness/Sky'', [[spoiler: the player character traveled back in time from a BadFuture to change the past. When they succeed, they have just enough time to say one last goodbye to their partner before they fade away.]] Ultimately averted, as the lack of RetGone makes the point moot.

to:

* In ''Videogame/PokemonMysteryDungeonExplorers Of of Time/Darkness/Sky'', [[spoiler: the player character traveled back in time from a BadFuture to change the past. When they succeed, they have just enough time to say one last goodbye to their partner before they fade away.]] Ultimately averted, as the lack of RetGone makes the point moot.



* In the ''[[VideoGame/RType R-Type]]'' games, a fanmade theory inspired by the obscure points of the plot, features the main antagonists the Bydo Empire (a race of biomechanical creatures that can directly control technology), created by humans as a ''[[TurnedAgainstTheirMasters weapon in the future]]''. The theory, really shortened, would result in the Bydos understanding how bad and evil their situation was for them. After failing mass suicide different times (because the humans like the player, fighting them, actually made them more powerful), the Bydo would go back in time and destroy humanity when the empire still wasn't created, effectively resulting in a long-term Grandfather's Paradox.

to:

* In the ''[[VideoGame/RType R-Type]]'' ''VideoGame/RType'' games, a fanmade theory inspired by the obscure points of the plot, features the main antagonists the Bydo Empire (a race of biomechanical creatures that can directly control technology), created by humans as a ''[[TurnedAgainstTheirMasters weapon in the future]]''. The theory, really shortened, would result in the Bydos understanding how bad and evil their situation was for them. After failing mass suicide different times (because the humans like the player, fighting them, actually made them more powerful), the Bydo would go back in time and destroy humanity when the empire still wasn't created, effectively resulting in a long-term Grandfather's Paradox.



[[folder: Web Comics ]]

to:

[[folder: Web Comics ]][[folder:Web Animation]]
* A Website/{{Newgrounds}} cartoon "Grandbunny Paradox" made fun of this. It featured a bunny and a stick figure. The bunny went back in time to kill his grandmother and finds himself turned into a sheep, because his grandfather married a sheep instead of a bunny. The stick figure decides to do the same and kills his grandmother only to find himself turned into a tomato. He doesn't like being a tomato so he goes back and shoots the guy who sold him the gun to kill his grandmother... only to find himself now holding grenades.
[[/folder]]

[[folder:Web Comics]]



* [[Series/{{Mythbusters}} Adam and Jamie]] decide to put this trope and the MyOwnGrandpa trope to the test when they went back in time in ''Webcomic/IrregularWebcomic''. They botch it up when they accidentally swapped grandmothers, making ''each other'' their grandfathers (Adam is Jamie's grandfather, Jamie is Adam's). Incidentally though, this does make them their own great-great-grandfathers, proving that this trope and the MyOwnGrandpa trope is possible. Myth confirmed!
** Incidentally, the people that ''should'' have been Adam and Jamie's grandfathers themselves went back in time to the Jurassic period, where they were eaten by an Allosaurus that used the time machine to go to the future and become president.

to:

* [[Series/{{Mythbusters}} [[Series/MythBusters Adam and Jamie]] decide to put this trope and the MyOwnGrandpa trope to the test when they went back in time in ''Webcomic/IrregularWebcomic''. They botch it up when they accidentally swapped swap grandmothers, making ''each other'' their grandfathers (Adam is Jamie's grandfather, Jamie is Adam's). Incidentally though, this does make them their own great-great-grandfathers, proving that this trope and the MyOwnGrandpa trope is possible. Myth confirmed!
**
confirmed! Incidentally, the people that ''should'' have been Adam and Jamie's grandfathers themselves went back in time to the Jurassic period, where they were eaten by an Allosaurus ''Allosaurus'' that used the time machine to go to the future and become president.



[[folder: Web Original ]]

* A {{Newgrounds}} cartoon "Grandbunny Paradox" made fun of this. It featured a bunny and a stick figure. The bunny went back in time to kill his grandmother and finds himself turned into a sheep, because his grandfather married a sheep instead of a bunny. The stick figure decides to do the same and kills his grandmother only to find himself turned into a tomato. He doesn't like being a tomato so he goes back and shoots the guy who sold him the gun to kill his grandmother...only to find himself now holding grenades.

to:

[[folder: Web Original ]]

* A {{Newgrounds}} cartoon "Grandbunny Paradox" made fun of this. It featured a bunny and a stick figure. The bunny went back in time to kill his grandmother and finds himself turned into a sheep, because his grandfather married a sheep instead of a bunny. The stick figure decides to do the same and kills his grandmother only to find himself turned into a tomato. He doesn't like being a tomato so he goes back and shoots the guy who sold him the gun to kill his grandmother...only to find himself now holding grenades.
[[folder:Web Original]]






[[folder: Western Animation ]]

to:

[[folder: Western Animation ]]
[[folder:Western Animation]]



* ''Wonder Warthog'' employs this with one case of glaring inconsistency. He is hanging out in a bar with Stoneage Warthog and The Hog from the Future (I may have the names wrong), and the latter decides to explore the nature of a paradox by shooting the former with a zapgun. Since Stoneage Warthog was the direct ancestor of the others, they cease to exist, while the city is retroactively turned into a crime-ridden cesspool because WW wasn't around to do anything. The Hogs are then immediately returned (since Future Hog couldn't have killed Stoneage Hog if he didn't exist) and everything is fine... except the city is ''still'' a hellhole, necessitating the heroes to fix it the traditional way.

to:

* ''Wonder Warthog'' employs this with one case of glaring inconsistency. He is hanging out in a bar with Stoneage Warthog and The Hog from the Future (I may have the names wrong), and the latter decides to explore the nature of a paradox by shooting the former with a zapgun. Since Stoneage Stone-age Warthog was the direct ancestor of the others, they cease to exist, while the city is retroactively turned into a crime-ridden cesspool because WW wasn't around to do anything. The Hogs are then immediately returned (since Future Hog couldn't have killed Stoneage Hog if he didn't exist) and everything is fine... except the city is ''still'' a hellhole, necessitating the heroes to fix it the traditional way.






[[folder: Other]]

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[[folder: Other]][[folder:Real Life]]



24th Jul '16 9:08:00 PM Geoduck
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->'''Rarity''': “How in Equestria is my travelling in time supposed to prove that time travel is impossible?”\\
'''Twilight''': “I explained this Rarity. Travel back along a given time line can’t be possible, because it could violate causality-—do you know about the ''Grandmother Paradox''?”\\
'''Rarity''': “No.”\\
'''Twilight''': “Suppose you travelled back in time to a point before you, and your parents, were born, and you killed your maternal grandmother…”\\
'''Rarity''': “Why would I ever want to do that? My grandmother is a delightful lady. Even if she does insist on wearing those dreadful frocks with such old fashioned sleeves.”\\
'''Twilight''': “But hypothetically—-suppose you did-—by accident-—”\\
'''Rarity''': “I would have trouble-—she’s a tough old mare.”\\
'''Twilight''': “Yes, but, ''theoretically'' you could do it-—when she was young. But then she would never give birth to your mother, so you would never be born—-so you could never go back in time to kill her-—it’s a paradox-—see!”

to:

->'''Rarity''': “How How in Equestria is my travelling in time supposed to prove that time travel is impossible?”\\
impossible?\\
'''Twilight''': “I I explained this Rarity. Travel back along a given time line can’t be possible, because it could violate causality-—do you know about the ''Grandmother Paradox''?”\\
Paradox''?\\
'''Rarity''': “No.”\\
No.\\
'''Twilight''': “Suppose Suppose you travelled back in time to a point before you, and your parents, were born, and you killed your maternal grandmother…”\\
grandmother…\\
'''Rarity''': “Why Why would I ever want to do that? My grandmother is a delightful lady. Even if she does insist on wearing those dreadful frocks with such old fashioned sleeves.”\\
\\
'''Twilight''': “But But hypothetically—-suppose you did-—by accident-—”\\
accident-—\\
'''Rarity''': “I I would have trouble-—she’s a tough old mare.”\\
\\
'''Twilight''': “Yes, Yes, but, ''theoretically'' you could do it-—when she was young. But then she would never give birth to your mother, so you would never be born—-so you could never go back in time to kill her-—it’s a paradox-—see!”paradox-—see!
16th Jul '16 4:05:52 PM nombretomado
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* In ''WesternAnimation/TheAdventuresOfSonicTheHedgehog'', one episode in the four episode arc about the Chaos Emeralds starts with Sonic foiling a plot by Dr. Robotnik to prevent his ancestors from marrying and thus eliminate Sonic from the timeline. Sonic succeeds in sending Robotnik packing, but then ''causes the paradox himself'' by ordering a chili dog from his maternal ancestor, causing his paternal ancestor to become impatient waiting to be served and leaves. After Sonic disappears, Tails solves the paradox in about a minute by forcing the meeting to happen.

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* In ''WesternAnimation/TheAdventuresOfSonicTheHedgehog'', ''WesternAnimation/AdventuresOfSonicTheHedgehog'', one episode in the four episode arc about the Chaos Emeralds starts with Sonic foiling a plot by Dr. Robotnik to prevent his ancestors from marrying and thus eliminate Sonic from the timeline. Sonic succeeds in sending Robotnik packing, but then ''causes the paradox himself'' by ordering a chili dog from his maternal ancestor, causing his paternal ancestor to become impatient waiting to be served and leaves. After Sonic disappears, Tails solves the paradox in about a minute by forcing the meeting to happen.
22nd Jun '16 11:07:26 AM PF
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So, then, killing your grandfather causes you to not exist, and since you don't exist, you never killed him. Which means he survives, so you exist, so you do go back to kill him. Which means he doesn't, so you don't; therefore he does, so you do, etc ... [[LogicBomb are you confused yet?]]

to:

So, then, killing your grandfather causes you to not exist, and since you don't exist, you never killed him. Which means he survives, so you exist, so you do go back to kill him. Which means he doesn't, so you don't; therefore he does, so you do, etc ... etc. [[LogicBomb are Are you confused yet?]]
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http://tvtropes.org/pmwiki/article_history.php?article=Main.GrandfatherParadox