Exclamation Mark by Amy Krouse Rosenthal and Tom Lichtenheld is just that book. From the moment I opened the book to begin to read until I closed it at the very end I had my class hanging onto every word. I'll let the characters tell you a little about it:
?: Have you read our book?
!: You really should!
?: Do you like Amy Krouse Rosenthal?
Do you like Tom Lichtenheld?
Have you read their books?
!: You should! You really should!
?: Do you like books about friends?
Do you like books with happy endings?
Do you like books with fun characters?
!: We're fun! We're a lot of fun! You should read our book! I was so lonely until I met question mark! Question mark helped me to be me!
?: Did I really help you to feel better?
!: Yes! You are the BEST friend a punctuation mark could have! Yes! Yes! Yes!