We had this german chick who kept going through our cupboards in my first year at uni, so me and my housemate put notes in our cupboards saying "stay the fuck out of my cupboard"...."is this stuff yours? no, so fuck off" (we really didnt get on with her, somewhat tainted my view of bavarians) And she complained to the residence warden about us and we got a written warning, WTF!
Also this year two of my housemates dont do any cleaning when we have inspections or take any bins, so my other housemate put a note up saying that me and him were not going to do anymore cleaning or take any bins out, and one of them wrote "this is my house aswell, i can do what i want" cunt.