I just bought the book, I Want My Hat Back, written and illustrated by Jon Klassen. Published in 2011, it won the Ted Geisel Award. It's such a simple book with a bear asking his animal friends, "Have you seen my hat?" A bunny, who is obviously wearing his hat, says "No. Why are you asking me. I haven't seen it. I haven't seen any hats anywhere. I would not steal a hat. Don't ask me any more questions." The bear moves on, until he realizes that the rabbit is indeed wearing his hat. The ending is priceless, and I laugh every time I read Bear's guilty answer to squirrel who is looking for a rabbit wearing a hat.