I once shared an on-campus apartment with a slightly unusual woman who became increasingly deluded and unstable (she was a talented artist however -- how i got to know her). She was a slob, but accused me of being the messy one. Her: "Yeah, your room looks neat, but it's not clean. It's disgusting!!!" (Really it wasn't.) Me: "Are you implying that you pick up all this stuff strewn everywhere, clean all your surfaces and then put it back again, because I don't think so." One day, she was so pissed off about something that she purposely got every single dish we owned dirty, then threw them on my bed. She would rip the phone out of the wall and unplug it while I was using it (because my dirty hand were on her phone.) She threatened with a knife.
It is a testament to my naivety that it was not me but she who wound up going to the campus housing department and complaining -- trying to get me kicked out. We had a hearing and the board sided with me (not surprising, since she appeared totally irrational and unhinged when she presented her case) and refused to let her stay in the apartment. To make things fair, I had to get another apartment too, but that was totally fine with me. After we were split up, she stalked me for about a year or so. Really strange.