This book contains a list of all the customers who have been to the Krusty Krab and is compiled by SpongeBob. It is fairly large and pink in color. The text of this book is in red.
Role in episode
The title is about the customers of the Krusty Krab and the reasons why SpongeBob loves them, hence the name. He and Squidward are the only sea creatures known to have read this book. It is known to contain the names of every person known to visit the Krusty Krab, excluding What Zit Tooya.
This is the first book SpongeBob has written. The second is SpongeBob's work diary, which is actually published publicly.
The book says it is by SBSP, which is SpongeBob SquarePants' initials.