Our family took in foster children from the time I was 9 'til I was 19. My mother is an ESFJ; it's all her fault. We developed a reputation at Social Services of being able to take the worst of the worst (a secret the other foster parents didn't share with my parents until after they retired from the biz).
The worst case we had was a particular two year old girl. From the minute she woke up in the morning until the time she passed out at night, she was a continuous, unstoppable force of malice and discord. When my mom gave the initial report to Social Services, they actually didn't believe her. So she kept a minute-by-minute log (but just for a couple hours - it was only a 100 page notebook). They were duly impressed when they read it.
After we had had her for 18 months, she was infinitely better than she had been for the first few months. She still had her moments, but she was about 2% of the handful she had been. Social Services decided to make her available for adoption.
A young, idealistic couple (heh heh), with no children of their own, took her in as a foster child, with the option to adopt at a later date. The woman ended up in the hospital from a nervous breakdown in just under two weeks. Amateur. :rolli: