How To Tell Your Roommate Is An Asshole

My apartment technically has four people living in it, myself, Behram, Peter, and Rui. Three of us actually live there and Rui is a ghost. The only things that Rui ever does is come at random hours of the night -- though he's only here about one night a month at most --, make the most awful hacking sounds such that you are sure he isn't human because no person is that full of phlegm, and occasionally argue with his girlfriend in some Asian language -- I can't tell them apart. That alone is annoying enough, but then over Christmas break, a desk appears in our living room that takes up an annoying amount of space, it has to be his because it isn't Behram's, I was in Utah, and Peter is in Perth. My question is why he doesn't have it in his room, given he spends no time here.

But the kicker is simple: he was here yesterday as the lights were mysteriously on in the apartment -- I'm the only one of the normal three in town. Now he is gone. Good riddance I say EXCEPT he left the window in his room wide open. Thanks to him there is an Arctic blast rollling down the hall of our apartment, making everything wayyy too cold -- my hands have dipped below optimal typing temperature, so I'm losing at least five words a minute in speed. I have to keep the door closed to my room, lest I freeze to death, and now the bathroom, which is right across from his room, is an icebox -- cold enough that my balls shrink even thinking of going in there.

In summary, Rui is a douche.