Working for a ISP, I heard this gem from the support guys. A lady called in and was very upset because a exchange student living with them was downloading porn into their computer. He said we could not help her, sorry lady. A few months later she called again asking that we block traffic from the students home country. He had left the country, but was hacking their computer from home and downloading even more porn. The helpdesk suggested that maby she needed a talk to her husband instead.