In my hometown Hammond, IN there was a notorious incident that occurred when I was a teenager. A disturbed resident a few blocks away would lure kids my age into his home with an abundance of alcohol and drugs. He was a quiet man that neighbors rarely noticed, although local kids would refer to him as Crazy Dave.
Apparently he was fighting demons inside, but eventually he gave in to their demands. He had strangled three boys during their incapacitated state, and buried their bodies in concrete in his basement. One of the boys was my classmate, James, a very charismatic and funny young man.
I would have frequent nightmares that Crazy Dave would come to get me next.