A bad roommate has sex in your bed. A good roommate makes you cookies. A great roommate goes back to Utah after one day on campus and leaves you with a room to yourself. The best roommate goes to rehab and leaves you with a double for the rest of the year. You are far more likely to have a bad roommate than a good roommate.
"Everyone has a weird roommate. And if you don't think your roommate is weird, chances are YOU'RE the weird roommate!"-Conan