Oh, the fun times I've had with roommates...
The highlight of my roommate career was probably when my "best" friend and I moved into an apartment junior year. We each had our own bedroom, but to get to the bathroom, you had to go through her bedroom. Well, she would get really drunk and bring home guys and lock her bedroom door, so I couldn't go to the bathroom. It was really fun going across the street to Handimart in the middle of the night. Also, when guys called for me, she wouldn't tell me because it "wasn't important."

I moved out after a month -- it was such a bad scene that I moved in with some guy I had known for about 2 weeks (that's another story for another time). Plus, we had bats, although I don't know if they really count as roommates.
Having not learned my lesson the first time, she moved in with me again about six months later. She arrived at the apartment with a big ol' box of dirty dishes (yes, dirty). She put the box of dirty dishes into our extra room and they stayed there (yes, dirty) until after I had moved out again, which was after the ants arrived...
Maybe later I'll tell you about my roommate freshman year...