For me:
The Omaha Kid: The first night we met we were talking and I asked if he drank/partied...he told me he did. Well, about 5 hours later we are going to bed, lights off...he goes "Hey, I lied to you before, I never did drink or party in high school..." I did not care, not one bit, but he basically never had much fun that year. He got in a fight with the 3rd roommate and got his ear split open and had to get stitches. I never saw him at NU after that year, not once.
The SmallTown kid: He was a year older and was kind of verbally abusive to his girlfriend like, it was really uncomfortable. I asked him early on about getting into bars and/or fake ids and he said "Yeah, I don't know, I am not really into bars or drinking" We tried a few times to get him to move out, he refused. He was kind of a jacka$$. Never really saw him again after that year.
Then I moved into a frat for year...