* "[F]ew picture books can match the visceral punch of this one's opening, which does for bad moods what Sendak's wild rumpus sequence did for bedtime naughtiness."
---Booklist, starred review
* "With its intensity and understanding, this bad-mood book rivals Jules Feiffer's I'm Not Bobby! and Molly Bang's When Sophie Gets Angry, Really, Really Angry..."
---Publishers Weekly, starred review
"[A] deceptively simple picture book by masters of that form... Its power goes straight to the visceral in a way that will resonate for a long, long time."
"Expressionistic art and economical poetry combine smoothly to create an inspiring model of self-control... While abstract and symbolic, this book has a healthful and hopeful message that readers will connect with emotionally."
---School Library Journal