I lived with this guy in Greensboro, NC my second year of Uni. We were good friends the year before, both really laid back and so we thought it would be a perfect set up. Over a span of about a month, he managed to piss me off. He had this girlfriend, she was nice enough, but she practically lived with us in this tiny ass apartment. I would come home to find her napping on the couch, using my bathroom stuff (towels), etc. She was pretty much always in the way, if you wanted to study, she would be watching TV, stuff like that, borrowing stuff without asking and leaving messes. So this builds up over about a month. Finally, she used my wash cloth and towel (my last clean set) and left it in the floor. So I asked her if she could use my roommate's stuff from now on. She was like well his stuff is clean, I didn't want to get it dirty.
So I jerked off into his shampoo and called it a day. Moved out about a week later to avoid getting into a fight. I managed to remain distant friends with my roommate, though his hair was a little more shiny and had a little less bounce.