I Want My Hat Back by Jon Klassen = awesomeness. I loved another reviewer's summary: "The plot is a classic whodunit; a likable yet slightly daft bear investigates the loss of his beloved hat." I can't say much more, since it's a pretty straightforward book. But the things we love about it are the totally understated illustrations and character expressions and text, the author's clever use of punctuation and ALL CAPS instead of exclamation points, and the unexpectedly hilarious ending. It's won the NYT Best Illustrated Children's Book Award and is a Theodore Seuss Geisel Honor Book. To quote the book jacket:
A bear has lost his hat. What if he never sees it again? WAIT! He has seen his hat ...
My husband took me to a bookstore for Mother's Day and instructed me to get any book I wanted. I chose this one. :) It'll definitely be a classic in my family.
Here's the Youtube book trailer, for your viewing enjoyment.
update by Alysa 7/8/15: If you want to go one better than the book trailer and buy this book, here is our affiliate link!