Underpants Dance Children's Picture Book by Marlena Zapf. A charmingly irreverent look at a mischievous kid-fixation: underwear! Underpants can be fancy or functional, but for pre-schoolers, it is always funny. Take Lily McBloom – she has the fancy kind and loves to show them off with a special dance to make everyone laugh. This horrifies her big sister who comes up with a plan to stop Lily’s underpants dance forever. But Lily is one creative girl, and with a little outside-the-box thinking, she can keep right on dancing! Hardcover. Published by Dial Books. 3-5 years.