This chapter book in Newbery Honor-winning and bestselling author Louis Sachar`s Marvin Redpost series offers a sidesplitting take on the differences between girls and boys! When Casey Happleton tells Marvin that if you kiss your elbow you`ll turn into a girl, Marvin doesn`t believe it. Then Marvin kisses his elbow by accident and starts to feel very strange. He wants pigtails and starts dotting his i`s with little hearts. Could Casey be right? Or is it all in Marvin`s head? You decide! Hilariou ...