Bikini Bottom Legends is a book that only appears in the short "Things to Do When Encountering a Legendary Creature." The book contains information on what the boys should do should they encounter a legendary creature. They should be polite, offer a gift, and run away. As they read "run away," we see Raarg, who then says, "I'm so lonely."
The book has a green cover, with a yellow section, and red font with the title. It says, "Bikini Bottom Legends."