This may have to be a running list and may have to be broadened to include men.
4. Cheyenne Cherry
As a "joke" she put a kitten in a microwave and let it die an excruciating death. Read more about this heartless teen here.
I know it would be cruel and unusual punishment and would never happen, but frankly stories like this make me fantasize about appropriate sentences, like getting an enormous microwave and putting this little bitch into it.