I wandered into the room of my best friend's three-year-old son, preparing to read him a book before he went to bed. When I saw this book among the pile on his floor, I got nostalgic. Really nostalgic. My mom read me the same book when I was his age, and I love, LOVE this book.
Not only does it teach you that sometimes the answer to all of your questions is right in front of you, but it does so by giving you pages of Grover, one of the most hysterical, lovable Muppets. The rattling of Grover's nerves, and the actual building of suspense in a picture book, keep the reader turning the book's pages -- even though Grover BEGS you not to do so. The reader is actually included in the narrative, for the book involves only Grover talking to the reader. The book thus becomes involving very quickly and entertaining throughout it.
Plus, the final punchline is a great payoff.
If you have children, this is an absolute must. Unlike other books from children's shows, this one's intelligent, maintains proper values and isn't beat-me-over-the-head annoying.