I get my internet (5mbps dl / 1.5mbps up) for free, my father had a business account and cancelled the home service, but they left the business account running, I've been having this internet for about 7 years and going. My ISP hasn't complained, and neither will I. =)
Though I'm really looking to get their 60mbps down/5mbps up service, but that will be in the future.