Back a dozen or so years ago I was a mod on a F1 forum. Most of the posters were sort of middle aged History nerd types (many were Dutch) and it wasn't a difficult job until some young English dick came on and was generally just being nasty to anyone who dared to criticize Jensen Button (who wasn't a world champion yet). Anyways I decided to give him a temporary ban because I was tired of hearing complaints about him, hoping it would make him f**k off. Instead he just created a bunch of new accounts and started threatening me, eventually he managed to find my address and threatened to mail anthrax or some other nonsense to me. We banned his IP address (which we considered the nuclear option at the time) and he seemed to go away.
Never got that anthrax