One or two people on here in the past, who were banned for being complete dickheads (and they really were being complete dickheads), decided to go to their mates houses, log in using their mate's username or create a trolling account using their mate's internet connection, and carried on being dickheads.

Result was, their mate must have known what they were up to, and so through their selfishness, they got that person's account banned as well. Fair enough maybe?