Many years ago, your mother killed Mary's mother, so Mary has hated you ever since. She does everything to see you suffer, really horrible things, she wants to take out the anger she feels towards your mother on you. She doesn't understand that you are not to blame.

But one day at school, you walk into class and Mary is already there, ready to make your day horrible. "My God, you are incredibly ugly and boring. That must be why no one likes you!!"