AlphaOops!: The Day Z Went First by by Alethea Kontis, illustrated by Bob Kolar
First Son grabbed this book as soon as we brought it home from the library and has read it at least once a day since. It's a humorous guess at what would happen if Z wanted to go first, instead of A. First Daughter enjoys the book, too, but she doesn't understand the concept of the alphabet as well as First Son. I think this book is perfect for early readers. They'll understand the humor better than if they only know how to say their ABCs.
First Son has recently decided he needs to act out the book. He uses the pieces from our ABC puzzle and lines them all up in order on the table, just like at the bottom of the pages in the book.