I see evil when I look in my shaving mirror. It is, philosophically, present everywhere in the universe in order, apparently, to highlight the existence of good. I think there is more to this theory, but I tend to burst out laughing at this point.
Terry PratchettVimes struggled to his feet, shook his head and set off after it. No thought was involved. It is the ancient instinct of terriers and policemen to chase anything that runs away.
Terry Pratchett