Assigned by lottery, kept on purpose
Whitney and I were assigned to each other by a housing lottery — bunk beds, cinderblock walls, one window painted shut. I walked in to find she'd already made both beds and left a note on mine: 'I took the left side, but I'm flexible on everything else.' Fifteen years later, I can confirm: flexible on everything, except the people she loves. She stayed up until 4 a.m. quizzing me before my organic chemistry final, a class she was not taking. She learned to make my grandmother's soup from a blurry photo of a recipe card when I was homesick. And when Silas appeared — patient, steady, hopeless at trivia — she called me and said, 'He feels like the left side of the bed. Like home, on the first day.' Silas, welcome home. Everyone, please raise your glasses: to Whitney and Silas!
Why it works: The first-day note pays off in the final line, turning a dorm detail into the definition of home.
Customize it: Start with the very first thing your roommate ever said or did, and find a way to let it return at the end.