When Gullible Guineapig visits his aunt and uncle's house, his relatives find out just how gullible he really is. Gullible will believe just about anything - that eating carrots will make you invisible, that you can wash coal, and even that there are monsters in the basement. But seeing is believing, even if you're not so gullible, in this hilarious story of a trusting young guinea pig and his not-so-nice relatives. Never fear, our hero will have the last laugh.