Retractable Appendages

http://static.tvtropes.org/pmwiki/pub/images/stitch_retracts_appendages.jpg
Experiment 626 changing from alien to "dog" in just seconds.
Exactly What It Says on the Tin, the ability to retract one's body like a turtle or snail. Your Mileage May Vary but it can be considered either Nightmare Fuel or Extremely Awesome when a human has such an ability.

See also Telescoping Robot and Retractable Weapon.


Examples

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    Anime & Manga 
  • Neiz from the Dragon Ball movie Cooler's Revenge who has the ability to retract his head into his body like that of a turtle.

    Comic Books 

    Film 
  • Inspector Gadget 2 has this happen to Gadget when he ducks a punch in the face at a bar.
  • In the film Lilo & Stitch, Stitch demonstrates this ability when taking refuge in a dog pound as seen above.
  • In The Hitchhiker's Guide to the Galaxy, Zaphod retracts one of his heads into his chest from time to time.
  • Kaiju movies starring Gamera, the flying turtle. Gamera can retract all four of his legs into his shell, then cause fire to spray out of the holes, allowing him to spin around and fly. He can retract his head into his shell the same way, and often does so while flying.
  • Toothless from How to Train Your Dragon has retractable teeth, hence his name. In the sequel, he is revealed to also have retractable scales along his spine.
  • An early Stephen Chow movie, The Royal Tramp, involved a battle with the Made of Iron villain who could even retract his manparts. But Stephen's character, having grown up in a brothel, learned how to counteract this by shoving something up the backdoor.
  • The electronic devices in The Brave Little Toaster all have retractable faces, with the exception of Radio, who for some reason actually doesn't have a face.
  • The title characters of Teenage Mutant Ninja Turtles (1990) all have the ability to do this. During the final Foot battle of the film, Mikey retracts his head into his shell to keep it from being taken off by a Foot mook's axe. "God, I love being a turtle!"

    Literature 
  • The Future Is Wild has the Flish with a retractable second mouth.
    • Slickribbons have the Flishes retractability brought Up to Eleven.
  • In the James Bond book You Only Live Twice Bond visits a Japanese martial arts training facility, where the fighters have been trained to retract their testes, making them invulnerable to a groin attack. You really do this (if you're a male), but to a lesser extent than they show in the book.
  • In The City and the Stars by Arthur C. Clarke, future humanity has been engineered so that male genitalia are stored internally when not in use.

    Tabletop Games 
  • Dungeons & Dragons. Giant Snapping Turtles are noted as being able to retract their legs and head into their shell, thus improving their armor class.

    Video Games 

    Web Originals 
  • A fun image on Neopets reveals Cybunnies can retract their heads into their body.

    Western Animation 
  • Lilo & Stitch has Stitch with retractable antennae, back spines, claws, and second pair of arms.
  • Filburt from Rocko's Modern Life. Justified that he is a turtle.
  • Gary from SpongeBob SquarePants also justified knowing he's a snail.
    • Also happens to Craig Mammalton in the episode "Sun Bleached".
    • Also happens to Patrick in the episode "Not Normal".
  • CatDog has the titular character retract its body like a snail, there's only one episode where the play it rather... Gruesomely.
  • Anything involving Turtles and Snails.
  • Shendu from Jackie Chan Adventures normally has arms and legs, but for some reason he actually loses both after being turned into a statue thousands of years ago. He eventually gets his arms and legs back once he's been reverted back from his statue form.

    Real Life 
  • Turtles
  • Snails
    • Snail eyes.
  • The glans in the penis and clitoris is this.
  • The foreskin in the penis is this too.
    • The penis itself is this to most animals.
  • The testes are this partially, sometimes to greater extents in some animals.
http://tvtropes.org/pmwiki/pmwiki.php/Main/RetractableAppendages