Hilarious In Hindsight / Fan Works

  • In Chapter 77 of Hottie 3: The Best Fan Fic in the World, which involved fusion, all three Crystal Gems fused into one being. A few months later, the Steven Universe episode "Giant Woman" aired on TV and established that Gems have the ability to fuse with others.
    • Even better, they all eventually did fuse together in a later episode.
  • All in the Family has a character named Acacia Castro-Avila whose Famous Ancestor is supposedly Fidel Castro himself. This is Hilarious in Hindsight when you realize that a year after the fanfic was published, Fidel Castro was revealed to have had many lovers.
  • The Child of Love: The title of chapter 8 is "You Are Not Alone". Keep in mind that chapter was published at least seven years before the first "Rebuild Of Evangelion" movie was a thing.
  • HERZ: In chapter 4 Asuka calls her daughter Akiko Aki-chan. Several years later, when Jimmy Wolk was writting The Second Try he named Shinji and Asuka's daughter "Aki-chan".
  • Rhythmic Pretty Cure happens to have at least a couple of unintentional similarities with Happiness Charge Pretty Cure (per Word of God, it's actually more similar in style to Yes! Pretty Cure 5 and Smile Pretty Cure!).
    • When the author started developing the series just over a full year before it premiered, he named the Mentor Mascot Ribbon. Then Happiness Charge Pretty Cure came along...
    • Rhythmic has half-Australian Cure Clubs as one of the main Cures. When the International Cures were introduced in HaCha, one of them was Cure Southern Cross, an Australian Cure.
  • During his Journey to the Center of the Mind in And Another Thing I Hate About You, Xander and Cordelia had to travel through and experience events that had a major impact on him (though out of sync with each other). Xander made a habit of grabbing whichever Cordelia he came across and kissing her stupid. He and Cordelia would also at times help out, thinking everything was a memory so they weren't actually affecting anything. Once they're back in the real world, Buffy mentions that for the past few years Xander would show up in places he shouldn't be or places he already was.
  • In Letter 55 of Zelda 12343's Dear Fanfiction Writers TOS Style!, Khan speaks out against the Kirk/Khan pairing, even though the author herself acknowledges she'd never seen this pairing on FFN. After Star Trek Into Darkness came out, Kirk/Khan became a popular pairing over at the Star Trek 2009 on FFN.
  • Dakari-King Mykan always wanted to make a more action-oriented story than Friendship Is Magic, to no real avail. Come the season 4 finale, suddenly the show he hates actually gets an amazing action sequence that blows any he could make out of the water (not like that's particularly hard). Irony at its finest.
  • Avatar: The Last Airbender fanfic The Stalking Zuko Series has tension growing between the Northern and Southern Water Tribes, with North viewing the South as uneducated yokels and the South view the North as stuck-up busybodies who didn't lift a finger to help them when they facing genocide from the Fire Nation. Then Season 2 of The Legend of Korra comes out...
  • The Glee Gender Flip story, A Different Direction, has Faith (female!Finn) complaining about Lebron James leaving the Cavaliers in 2010; a few months later, Lebron would return to Cleveland.
  • This fanmade Death Battle has Link use his strength enhancing gauntlets to use a pillar as a club. Come Hyrule Warriors, he now has this as an attack.
  • In Chapter 7 of Necessary To Win, Yukari infiltrates Anzio, which, instead of Saunders, is Oarai's first opponent. In the Anzio OVA, she ends up infiltrating Anzio as well, but unlike in the fic, doesn't get caught.
  • Dakari-King Mykan's reasons for creating The End of Ends become extremely laughable when the finale to another one of his stories, Cyborg Davis, has an ending that's exactly like the ending to Things Change. Beat. For. Beat.
  • Tara Gilespie, author of the most infamous Harry Potter fanfic of all time, predicted in an author's note before Deathly Hallows came out that Harry would have to let himself die in order to defeat Voldemort, because he himself is a Horcrux. Fast forwards to when the book came out, and she was right! A lot of people had the same idea, to be fair, but the fact that Tara of all people figured it out is hilarious.
  • In the Fairly Oddparents fanfiction, Never Had A Friend Like Me, the idea of using a volcano as a way to destroy magical objects and Timmy almost dying by an anti-fairy dropping him into lava both showed up in this story a few months before the premiere of A Fairly Odd Summer...
  • In Trolling the League, Naruto and Xanna claim to be highly advanced aliens who elevated humanity millenia ago. In an omake in the sequel Xanna runs into a human who insists gods don't exist and that she must be a highly advanced alien who elevated humanity and/or has come to soften up Earth for an invasion.
  • The Vampire Diaries Gender Flip story, 'The Sara Diaries', features Stefan as a girl named Sara Salvatore. In Season Six, it was revealed that there actually was a Sarah Salvatore, Zach's long lost daughter.
    • Said story also predicted that Stefan and Damon's mother is still alive.
  • In Super Sentai Vs Power Rangers The Liveblog, part of the reason why the writer chose Sean in the first act of the arc was that she wanted to have him take part in a Gokaiger-related arc, especially when Alex and Jason would have their own episodes in Power Rangers Super Megaforce later on. About a week after covering Kaizoku Sentai Gokaiger vs. Power Rangers Samurai, there was an announcement that confirmed Sean's appearance in the final episode of Super Megaforce.
  • Weiss Reacts: The fic featured the Humongous Mecha Gurren Lagann as a regular plot element, had Jaune crossdressing for a Saber cosplay and Cinder joining the school as a teacher. Months later, the Atlesian Paladin is unveiled as a regular plot element of Volume 2, Jaune ends up crossdressing to cheer Pyrrha up, and Cinder ends up in Beacon as a student.
    • Similarly, plushies of Weiss are a Running Gag- and one Ensemble Darkhorse, Vivi, is an animated Weiss plushie. Now that Rooster Teeth have actually started selling Weiss plushies....
  • Fallout: Equestria: Snowfall introduces us to crystal pony unicorns. Crystal pony unicorns appear in Fiendship is Magic #1.
  • "Cutie Mark Crusaders Dream Warriors" had Princess Luna help the CMC fight back against their nightmares. As of season 5, all three of them have received aid from the night princess within their dreams.
  • Back in 2001, an author named Kanius did Digimon Fusion (Digimon characters play the roles of DBZ) and is doing a remake called Digimon Fusion Kai around 2010. Comes 2013, that the english version of Digimon Xros Wars is titled 'Digimon Fusion'.
  • An artist on DeviantArt made a StarCraft image involving Zergified!Kerrigan and Terran!Kerrigan in a Screw Yourself scene. A certain Starcraft II Heart Of The Swarm cinematic does have the two in a rather tight embrace, if for slightly different reasons.
  • Somewhat an inversion of ascended fanon. The English dub version of Guilty Crown in the final episode's epilogue, the casts last words are "To the New Year!", then co-authors are doing a mega crossover fanfic based on New Years Eve.
    • Then plays straight in other parts. In Chapter 8, Captain Ginyu mentions his thanks of Freeza getting back his own body back. I wonder what happened officially in Dragon Ball Super?
    • Chapter 1 has Kirito mention himself being Samurai Jack, alongside the Minions of Set appears and Arago's super form looks like Aku. Then, Adult Swim renews the cartoon for 2016.
    • Chapter 32 shows the The Powerpuff Girls (2016 versions) siding with the Green Lanterns (John Stewart, Razer, and Aya). Promos of the PPG reboot shows the girls creating similar constructs.
  • This piece of fanart for The Legend of Korra depicts several characters discussing their reactions to fan pairings involving them. Panel 4, where Asami is trying to convince her father that there's nothing going on between her and Korra is hilarious if you've seen the show's finale.
  • Pretty Cure Perfume Preppy:
    • In episode 32, a Spaniard Pretty Cure explains that there are other Pretty Cure teams around the world. A few years later, that would become canon.
    • The main character of this fan fic is named Chloe. As of 2015, Smile Precure is being dubbed as Glitter Force, and one of the dub names revealed is Chloe (but the Chloe in question is Reika/Cure Beauty).
  • The first completed Naruto fic on FF.net was a Naruto/Sasuke fic (in fact many early fics were). It ends with an author note that says "More Naruto fics, I think, are needed". Within six years Naruto would be one of the biggest manga fandoms and is only behind Harry Potter as the fandom with the most fics on the site.
  • This fanfic crossover has Ben Tennyson and Yang as a couple and they get along pretty well. Volume 3 arrives and Ben's voice actor, Yuri Lowenthal, is now the voice of Mercury Black and he and Yang are enemies. What makes it hilarious? The fanfic came first before volume 3.
  • This fanart seems to have been adapted into the Work it is based on

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