When I was 22, I wrote a children's story called MalBova, the Evil Cow Sorceress. It was about a young sorceress who worked in servitude to a very powerful evil witch in order to betray her and steal her terrible Wand of Power, which gave the user complete power of pain or pleasure over others. However just before the Wand of Power was stolen, the old witch cursed it so that yes, it would give great powers to the user: the ability to cause Crushing Pain or Ecstatic Pleasure in others, but it would only work on cows. The Story was about the choice of being a regular person or choosing terrible powers, even if it only worked on barnyard animals. Naturally, rather than give up on power, the young sorceress became MalBova the Udderly Horrible. Now I realize that MalBova is a surprisingly common and depressingly true story.