You and your brother Mark, were very close as kids, but he was always a bit troubled. He always had violent tendencies, and would hurt small animals. He was always bullied in school for being the weird socially awkward kid who didn’t talk to anyone. Despite all this you were always your brothers best friend, and the only one he would really talk to. You’re both adults now and have gone off to collage, but are staying at your parents house for a family reunion, when he comes in late at night one night when everyone is asleep, covered in blood.