Kerry Miller's website features photos of plaintive notes left for people, citing any number of infractions. There's the leaving-the-dishes-in-the-sink, the stealing-your-coworker's-food-from-the-fridge, and roommate-vs.-roommate-thermostat-war. This book showcases notes from the site.
Passive Aggressive Notes
Painfully Polite and Hilariously Hostile Writings