Mo Willems is a genius. These books work like a classic Warner Brothers cartoon; working on two levels simultaneously. There's simple sight-gag humor for the kids; and sly, subtle humor for the grownups. The sparse but extremely expressive artwork is a joy to behold and study. My 4 year old daughter encounterd this book in a library while on vacation this summer. We all find the book and all the others in the series to be excruciatingly funny! We read the books aloud; I play Gerald, and my daughter plays Piggie. (I also do any other minor characters) We read the dialogue in a huge, over-the-top, melodramatic fashion, doing our best Mel Blanc/Daws Butler impressions, and act out the physical bits where we can... She just dissolves into fits of hysterical laughter... We have all of the Piggie books now, and several of the "Pigeon" series too. I cannot recommend the works of Mo Willems highly enough!