Cute book. It reminded me a lot of this Calvin and Hobbes strip:
http://pactiss.org/wp-content/uploads/2011/02/gripofreason-CH.jpg

This book won the Independent Publisher Book Award. It only uses actions (from the illustrations) and sounds (from text bubbles) to tell a story of crocodile and monkey, who are not friends but their angry sounds turn to silly sounds and they slowly begin to play with each other. When danger arises, crocodile helps monkey run away and hide. This book is a good example of a picture book, and fits this genre perfectly since it relies on pictures to tell the story line.