Will kissing his elbow really turn Marvin into a girl? That's what Casey Happleton claims, and Marvin starts to believe her after his lips "accidentally" brush his elbow. A lighthearted look at the mysterious differences between the sexes. Marvin Redpost may be deluded, he may be dreaming, he may be filled with anxiety, but he's never boring! The typical third-grader has ALL the fears and trepidations that any kid might, and then some. Always hilarious, readers will eat him up.