* An abused, teased, bullied girl gets accepted to Hogwarts... and is made Head Girl before she even arrives!
* Potter tries to kill himself. Draco finds him, heals him, and the two fall in love (and into bed).
* Snape has a stalker-girl who has loved him forever and followed him through "the ages".
Bah. People, people: enemies very rarely jump into bed and have sex for no reason. If you make a canon character act utterly off-character, then why the hell did you bother writing about him or her to begin with? No, no, no, Snape and Harry have NOT always had feelings for each other.
My 'people who need to die' list just keeps growing and growing. If you cannot write, if you cannot stay within theme, if you cannot spell, if you do not know how a comma is used, then stop writing!