Spending an unnecessary amount of time in the bathroom to prevent your roommate from using it. This is often a subtle form of revenge for those who are unfortunate enough to live with a rude slob.
Last night, I had a bathroom bonanza around the time my roommate usually gets ready for bed. I hid out in there for an hour - showering, and getting ready for bed myself although I stayed up for hours afterward. I painted my nails for the first time in months, admired my new tattoo in the mirror and enjoyed some relaxing BBM time. Maybe now she's thinking the same thing I am... BITCH SHOULD'VE CLEANED.