Your enemy Sarah

If there was one person you could call enemy it was Sarah. Though it has never been an open fight, she always found a way to make you feel humilated or wrong. She never gave you names directly and she acted if she even didn't know what you meant when you asked her, if she hated you. Still she always found a way to make you feel bad only by small actions or a joke. Quiftings the name of the best chips in the world was enough to make you happy, but the company went bankrupt and suddenly these chips were gone. So there was this last bag in the school's snack machine and just before you came Sarah bought it. She don't even liked Quiftings, but she bought the last bag while you had to watch.