Via Cosmo Confessions 

"My roommate can be really mean, and one day, her bad attitude got on my last nerve. So when a guy she had been lusting over -- who had recently become single -- stopped by, I hatched a plan to get even. She let him in, then went upstairs to primp. I decided to introduce myself and told him to be careful because my roomie has a revolving door to her bedroom and is on quite a few meds for STDs. That was the last time he came over, and she couldn't figure out what happened." -Jojo, 22

Oh Jojo! Tisk Tisk... What did we accomplish here, really? If your room mate was being a bitch, well then it sounds like she really needed to get laid.  And what did you do?  Prevent the one thing that might have made her simmer down, and make your life easier.  If she became bitchier after that, then you can only blame yourself.