i was that roommate for 5 years. during the winter it was pretty mild, i'd let the beater melt out in the hall before bringing it in. but every spring, the kitchen became a shop, the table was cluttered with frames, grease smears, little ziploc baggies of bearings, races and retainers... the kitchen couch (yes, kitchen couch) was full of bikes and wheels... i'd take in other peoples bikes to fix them and have a constant rotation of various bikes in and out all the time. eventually my roommate saw the lil '86ish mongoose m-1 bmx bike all original that i scored for something like $50 and was converted to a bike nerd himself. promptly came home with a box containing a new crankset for his trek mtb one day to my surprise, asked if he could borrow my tools... i was rather pleased.