"Reality Shifter"

In a Town or City of Sorts, you are taking a Walk when you spot a notebook with the title "Reality Shifter". You Read the instructions. "Anything you write in this book will Come True/ Happen. There are Four Rules. 1. Nothing you write will effect you unless you say so 2. Whenever Something Happens, Nobody is shocked or anything, it's just normal and casual to them. 3. Nobody is Physically able to know about the Notebook no Matter What they see, but if you tell somebody then they will not hear it 4. The Notebook is Unbreakable, Un-destroyable and Unable to be Lost or Stolen." At First you think it's a Joke, but you might get surprised...