Homeless Drug Dealer
It’s never great when a housemate brings someone else into the house without permission. However, it’s even worse when that person is a drug-dealing bum. One Redditor said that this was one of her worst housemates because it created a horrible living situation.

Ashley1018 said: “Probably the girl who dated the homeless drug dealer. He ended up moving in (without my permission) and started dealing out of our apartment (definitely without my permission). He also had the rankest boots I’ve ever smelled that he would leave in the living room.”