On a night in 2013, a woman in her 30s named Erin heard loud banging on her front door. She opened the door and saw her best friend Robin standing there. And she could tell right away that Robin was scared. She was shaking, tears were running down her face, and she had scratches on her arms. Erin led Robin inside to the couch, and asked her what was going on. Robin said she had gone over to her ex-husband’s house to drop off their two daughters. Everything between her and her ex had seemed fine. But then her ex-husband’s new wife came into the room, and had just started yelling. And before Robin could even say anything, the woman ran across the room, lunged at her, and started fighting. Erin sat there and listened. And she wasn’t at all surprised. She knew the woman Robin had been fighting with. When Robin was finished talking, Erin told her never to be alone with that woman, because Erin said that woman was “the kind of crazy that will kill you.”