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Sazae-oni (栄螺鬼, lit. shellfish ogre) are yokai that resemble large crustaceans. They are a type of obake, forming when turban snails, especially "Turbo cornutus," reach 30 years of age.
Sazae-oni are also portrayed as a testicle-stealing temptresses. The most popular legend of the Sazae-oni is that a group of pirates rescued a drowning woman from the sea and took her back to the ship. They vied for her attention, but soon found that she was willing to have sex with all of them, cutting their testicles off afterwards. The men, obviously upset, threw her into the ocean, where she revealed her true form, and bartered with the captain for their testicles back. The Sazae-oni ended up leaving with a large amount of pirate gold. Testicles are sometimes called kin-tama or "golden balls" in Japanese, so the punchline goes that gold was bought with gold.