The narrator encounters a strange creature while scuba diving in Hawaii called an Atoo-fen-horn-fro-torto-shark. At first the creature appears frightening with its beak, tortoise shell back, and shark-like tail. However, it turns out to be playful and tries to make the narrator laugh by chasing them through the ocean. Though unusual, the narrator grows accustomed to the creature's foul stench. After a fun day swimming together, the Atoo-fen-horn-fro-torto-shark disappears back into the sea and has never been seen again.