Everybody has had a bad roommate; if you haven't, you're probably the bad roommate. It is not that hard to clean up after yourself, communicate, and be considerate of the people you live with, yet many people struggle with it. I've heard so many roommate horror stories through the grapevine that are almost hard to believe. Somebody I know lived with someone who peed in the kitchen sink, and she walked in on him doing it. If you are wondering, yes, there were dishes in the sink. I have also hear…