"On Monday, the American Library Association its list of the "most-challenged books," that is, books that have received the highest number of "formal, written complaint[s] filed with a library or school requesting that a book or other material be restricted or removed because of its content or appropriateness." Dav Piley's Captain Underpants tops the list, and is joined by books like Khaled Hosseini's The Kite Runner, Toni Morrison's Beloved and E.L. James' Fifty Shades of Grey."