I'm sorry but this blog NEVER gets old. Everyone, or at least people who have lived in an apartment block or worked in an office, has received a passive-aggressive note, or at least deserved one. And most people have at least wanted to leave one for someone else.
Here are a recent selection:
The Unabashedly Aggressive.
The Straight-Up Racist (unless his name is Mr Tim Korean I suppose).
The Excellent Bluff (I hope, for his/her sake).