I had a weird outlet in an apartment once (old house converted). It wasn't on any breaker for any of the apartments (in the known breaker locations), didn't seem to affect the meters, and refused to blow even upon brief (and stupid) application of a deliberately shorted out plug. Nothing like living in the third floor of an old wooden house with unfused circuits in it to give you a warm fuzzy
Are there a lot of college kids in your building?