The benefits of living with a roommate are plenty: cheaper rent, new friends, or at least new drinking buddies. There's also the possibility that your new roomie could be the type of person who watches you while you sleep, stores his piss in glass bottles, and doesn't pick up after himself.
Living with a stranger is a crapshoot, particularly if you've found that person on Craigslist. Don't believe us? Here's some convincing evidence: The 15 Sketchiest Roommate Ads on Craigslist.