I haven't read this book, but every time I see the cover I start laughing desperately. The bear's expression alone is priceless, but I am pushed way into the red when I try to decide whether the BEAR is asking YOU the question, or YOU are asking the BEAR that question.
A chagrined, almost guilty-looking bear who either has either placed or received an unwelcome phone call is my favourite thing on Earth, and this cover design captures that PERFECTLY.