Kerplopitgoes Island is a location in Rocko's Modern Life where all turtles must go to upon reaching their 21st birthday. In the episode Born to Spawn, Filburt tries in vain to resist his bodily urges to make the trek there. Once he, Rocko and Heffer reach Kerplopitgoes Island, they realize it is just a place for Turtles to party and procreate after reaching their coming of age. It is a parody of the Galápagos Islands. At one point in the episode, Filburt carves a replica of the island from a teriyaki and pineapple birthday cake. This scene, along with the island's general shape, are parodies of the Devil's Tower as referenced in Steven Spielberg's Close Encounters of the Third Kind.