I've never had any viruses. I run my virus checker regularly, and my firewall is also pretty good. I don't download random files for no apparent reason, and I don't aimlessly surf the web, either. Well, If I have had any viruses, I've not noticed.

The "best virus I've seen would have to be the "I love you" virus. My friend contracted it and was attempting to reformat his Hard Drive. Unfortunately, in order to reformat the drive, he had to enter the name of the drive so that DOS would recognise it. The virus (apparently) caused the name to be totally screwed up, and he was asked to enter some very unusual characters and symbols which - as far as we could tell - weren't even available on his keyboard.