It's bad to steal from your roommates.
Joe has a date coming up and knows that his roommate, Tim, just bought a new blazer that he intended to return.
Joe wants to wear a nice outfit on his date.
Joe asks Tim if he has anything nice to wear that he can borrow for his date.
Joe takes Tim's blazer without asking and spills wine on it during his date.
Tim lends Joe an old blazer that fit perfectly, and was able to return the new one for a full refund.
Tim's blazer is ruined and can't be returned.