Freaky Friday Flip / Fan Works

  • In His Shoes inflicts this on Zuko and Sokka, back when they were still enemies.
  • Another fanfic called In His Shoes, this one from the Rurouni Kenshin fandom, has Genius Bruiser Hiko and Bishōnen Fragile Speedster Kenshin swapping bodies during a sparring match and trying to avoid detection. Aoshi almost figures out what happened, detecting the switch but not realizing it wasn't an advanced training technique.
  • The X-Files fanfic Impulse has Mulder and Scully swap bodies. Hilarity Ensues as Scully has to interview an abductee and Mulder is forced to do an autopsy.
  • In The Switch Glitch, a magic e-mail chain letter causes an eccentric Fullmetal Alchemist fangirl to swap bodies with Edward Elric himself (for the first quarter of the fic at least). Hilarity Ensues.
  • Done in Episode Nine of Demyx Time, with the two Kingdom Hearts leads Demyx and Axel.
  • Both Meg's Family Series and The Spellbook use this trope, the former with Family Guy's Peter and Zack, and the latter with Meg and Lois.
  • A Mile in His Shoes uses the "learning experience" part of this trope with One Piece's Zoro and Sanji's rather opposite approaches to romance being contrasted to the benefit of both.
  • The Self Insert fanfics Spellbinding Radiance and Mass Vexations engaged in a flip in which the two author avatars switch bodies across fanfics. It was mostly played for laughs, and within the continuity of both fics it's treated as a Bizarro Episode given that it was an April Fools' Day prank.
  • In 10 Miles In Your Shoes, Kai and Tyson of Beyblade explore each others life through this.
  • In Trading Places, Sponge Bob swaps bodies with Eliza Thronberry's older sister Debbie.
  • In Calvin and Hobbes: The Series, this occurs between frenemies Calvin and Socrates and (unsurprisingly) Hilarity Ensues.
  • Harry Potter:
    • The infamous Body Swap Day at Absit Omen saw a fair chunk of Hogwarts' population randomly swapping bodies thanks to a breakfast-time prank. It wore off by dinner, leaving enough time for a few relationship revelations and a canceled Quidditch match.
    • At least a dozen different stories have involved body-swapping, usually as the result of a potions mishap or screwed-up spell. Popular choices include Harry/Draco Malfoy and Harry/Snape.
  • In Joy Ride, Starsky switches bodies with his car. Naturally, Hilarity Ensues.
  • The Infinite Loops will sometimes shuffle Loopers around to different positions when they reboot.
  • Several of them occur over the course of Diaries of a Madman. So far they've been used for revenge, a competition to see who can act the most like the other, or have been caused by Twilight messing up a spell.
  • A Walk In Your Shoes has Lily and James experience this in their seventh year at Hogwarts with a twist of the understanding of the other being a prerequisite of changing back to thier original bodies.
  • This is a rather common trope in We Are All Pokémon Trainers. Examples include:
    • Happened three times from Sinnoh to Unova-1, first with Jane and Palkia, the second time with DS and Artemis and the third with Daisy and Pink. A weird variation of this also seemed to happen between Jane and Entei.
    • Happens yet again with Anom and Wolf, due to a Manaphy. Unlike the other examples, it's played as a more serious major plot point rather than a brief joke, and lasted for pretty much the whole Oblivia arc.
    • This later happened in Kalos when a particularly "playful" Obscuric being decided to swap Mezzo and Eskay's minds. This ended up causing a small amount of chaos, especially when the fix turned out to be a kiss.
    • Deziree, Psyche, and Pentigan end up switching bodies for a brief period during the Fiore portion of Ranger-2.
  • The story Cutie Mark Crusadicorn has Twilight Sparkle accidentally switching bodies with Apple Bloom, Sweetie Belle and Scootaloo at the same time, leading to a combination of Two Beings, One Body and Literal Split Personality.
  • In Princess Trixie Sparkle it's the driving conflict of the entire story: Twilight and Trixie are swapped body, Spike is switched with Rainbow Dash, Applejack is switched with Fluttershy, and Rarity is switched with Pinkie Pie.
  • Manaphy and its attack Heart Swap is often the catalyst for these types of plots in Pokémon fanfiction. (And even some non-Pokémon fanfiction.) Along with the aforementioned swap in the We Are All Pokémon Trainers roleplay, Manaphy is often responsible for swaps between trainers and their Pokémon, Ash or one or more of his companions (like here), or various characters in Pokémon Mystery Dungeon fanfics. There's even at least one (unfortunately dormant) fanfic involving Manaphy switching Eusine the Suicune-obsessed researcher from Pokémon Gold and Silver with Suicune itself, much to the latter's chagrin.

http://tvtropes.org/pmwiki/pmwiki.php/FreakyFridayFlip/FanWorks