I love Snape's Diary.
Snape: Today I had oatmeal for my breakfast. It was flaverless and watery. I thought of my mother. I cried.
Snape: Today that Potter boy showed me his middle finger. When I attempted to punish him with detention he shoved me into a wall screaming, "bother, bother" over and over. Later he and his orange friend repeated the violent act until I lost conciousness. Tonight I prayed for the first time in twenty years; I prayed for the end.
Snape: I lost a button on my cloak today. Minerva pointed it out in front of the entire faculty.