Imagine this situation: you've just had your birthday. And you receive a package with a message.
You haven't been born yet; your mother is in the delivery room while you read this. Everything you've experienced so far has been an accurate simulation of what your life will be like. This is the moment you choose whether or not you want to be born.
You can press the green button, forget everything that happened in the simulation, be born, and continue your life.
Or you can press the red button and not be born. Everything will go dark, and you will never have existed.
Imagine this situation: you've just had your birthday. And you receive a package with a message.