During my freshman year, I got shoehorned into a "crowded double" - i.e. they stick 3 people in a room intended as a double.
Roommate #1 and I had the same first name. Whenever anyone called to talk to either of us, she ASSumed the call was for her - "Oh hiiiiiiiiiiiiii!". She's also one of those people who won't admit she doesn't know who the person on the other end is (no caller ID) so she'd spin them out until she figured out who they were. She once talked to one of my sorority sisters for five minutes before she figured out she was from my sorority, not hers.
Roommate #2 was cool until she started dating the guy down the hall. We'd established a "no sexile" rule - no overnight male guests - but she would constantly be making out with him in our room, in his room, in the floor lounge, etc. It was very disgusting. And then she'd get all huffy when Roommate #1 or I asked him to leave because we wanted to sleep.
And, Roommate #2's boyfriend was a racist. He poisoned both my roommates' minds. It wasn't long before they wouldn't give me the time of day.
The up side to this was that I landed a sweet single mid-spring-semester (and freshmen do NOT get singles in that dorm) and the "twins" had to move to a different floor, because if they'd stayed on the same floor, they would be in a crowded double again with some random frosh. Good riddance to bad rubbish.