Come up with an annoying habit and write about a world where this is a good thing! Maybe you don’t like it when people pick their noses. Why not write about a world where all the cool kids pick their noses!
Write about something shocking happening to a normal person. This could be something great (like winning the lottery) or something not-so-great (like finding out you’re about to die).
Write about a life-changing event in a character’s life. This could be ordinary, magical, or anywhere in between—just make it something important to your protagonist.