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For Harbor Days Festival, Phineas and Ferb celebrate by creating a mechanical version of the historical elusive shark of Danville Harbor. Seeing what the boys are up to, Candace enlists some help to capture the mysterious shark. Meanwhile, Dr. Doofen... (more)shmirtz invents the 'Salt Water Taffy-inator' to give cavities to every kid in the Tri-State Area.