The Oblongs, the WB network's new animated series that premiered on April Fools' Day, opens with the sound of a flushing toilet. Chipper voices, who could be singing about the Flintstones or Scooby Doo, sing the show's setup: As cartoon waste flows from a fancy mansion down into a valley filled with decrepit houses and power lines, the voices chirp about how "a chemical spill came from the people living up on the Hill," and we get a glimpse of the show's title family, living, fa-la-la, "by the landfill with hazardous foam, in their happy, glowing home."