Weird/Annoying Roommate Habits?

Does anyone else have roommates with weird habits that just drive you insane? I don't know if it's just me being petty, but my roommate never, ever opens the curtains in our living room and kitchen (the only two common areas in our flat with windows) and I just find it really irritating to be the only one who opens them? She also never closes the toilet lid when she flushes the toilet lid, yet somehow makes the toilet seat really loose whenever she uses it. Does anyone else find these things irritating?