My RA my freshman year got busted reselling cable tv service. The dorms provided basic cable but you could pay the cable company extra for a converter box to get the extra channels. He had a box and decided to offer the upgrade to others on the floor for a small fee. My roommate and I had a box, so we passed, but several guys took him up on the deal. All was going well until he accidentally cut one room's cable and they called the cable company to fix it.
Of course, this was the same guy who had a second fridge to hold all the alcohol he confiscated from us. (Technically a dry campus)