S1, E13: It's Halloween again, and like every year before, SpongeBob is the easiest scare in Bikini Bottom. This year SpongeBob is determined to turn the tables and scare everyone at Mr. Krabs' Halloween party. With Patrick's help, SpongeBob devises what is sure to be the scariest costume ever. Although SpongeBob's costume scares no one, his presence does summon Bikini Bottom's most feared ghostly legend - The Flying Dutchman, who is appalled by the way SpongeBob is portraying him. Squidward reluctantly agrees to take care of SpongeBob's pet snail, Gary, for a few days while SpongeBob is out of town. When Squidward's negligence causes Gary to become ill, SpongeBob accidentally takes a dose of the snail medicine, which causes SpongeBob to turn into a snail. Squidward is now faced with taking care of both Gary, and the impossible SpongeSnail.