Well I had no less than 2-3 roommates all 4 years of college! I still talk to some but others just worked my LAST nerve!
Fortunately, during the last 3 years we all had our own rooms and bathrooms so I didn't have to worry about that.
BUT HOW ABOUT....
If you eat something, what's so hard about rinsing it off and putting it in the DISHWASHER!
DO NOT eat my food! I don't care if you let any and everybody eat your food, but that doesn't go for my stuff! If you ask BEFORE you take, then that's a different story.
If you wash your clothes, DON'T leave them in the washing machine for several days to the point where you have to rewash them to get the mildew smell out!
When listening to music, can you actually be in the room while doing it? My one roommate would blast her music, leave and lock her door so we couldn't even get in her room to turn it down.
How about...if I tell you that MY boyfriend is coming over, can you not walk around half naked when he gets there and then proceed to TRY and flirt with him!

Yall know I had to CHECK that one forreal!
I'm just going to stop now before I really start to vent!