Lock 'Em Up: The Stories Behind 12 Banned Kids' Books

The Captain Underpants series — comic-book-style stories about the adventures of two fourth-graders and their superhero principal — has the distinction of being one of the top 10 most frequently banned and challenged books in 2002, 2004, and 2005 "for offensive language and modeling bad behavior." Yes, there is a lot of potty talk in this series, but a Connecticut elementary school banned the books because officials thought that it was inspiring their fourth-graders to get into even more mischief.