Hmm. I forgot about this one, since I had very few roommates, both in college, and when later on. I lived with a friend one summer, at the beach, in her dad's condo. we paid him rent, but well below the going rate, since he wanted us to be safe. It was fun, we lived at the beach, waitressed, and generally had a good time.
She did have some quirks though; mind you, we never really put together a schedule of chores, but each did what needed to be done, and it worked. We worked different shifts too, so we weren't always home at the same time. But it turned out she had some very PA habits.
And neither one of us, I thought, was a particular stickler about dishes, etc. So I'd sometimes eat breakfast, then rinse and leave my dishes in the sink, to wash or put in the DW later on. And if I happened to see any of hers there, or maybe a cup lying around, I'd either wash them all or put them ALL in the DW. Didn't matter whose they were. She all of a sudden, apparently didn't like that i left dishes in the sink, and while she'd put HERS in the DW or wash them, she'd leave mine. Which was childish and petty since she never actually SAID anything to me.
She was also a bit possessive about her "stuff" we bought our own groceries, but also some together, like milk, eggs, bread, and so on. but certain things, she bought for herself, she made a point to ask me not to eat. Um, you bought them, they're yours, so no i won't. not without asking or being offered. So while she wasn't the roommate from hell, she's someone i definitely would NOT ever live with again.