i am so pissed off right now

OK... so I'm out of town for a funeral. I check my email today and see that my roommate is planning a damn potluck dinner the night that I get back into town. No phone call. No notice. No warning or nothing. Just sends out some emails to invite a bunch of people to our house. How fucking insensitive can you be? Not only has this chick had visitors (her parents and boyfriend) at our house for the past two weeks, but she goes an invites the whole damn department to our house the night I get back from an out-of-town trip - without clearing this by me first? WTF? I'm about to e-tell her about herself.