The only other documentary style horror I’ve seen to date had been Behind The Mask. While I strongly recommend that, I wouldn’t so much with The Poughkeepsie Tapes.
Don’t get me wrong, I loved this movie. Outside of the effects used to simulate the cheap VHS tapes, it was really good. However, it’s not comfortable material at all. Watching 1.5 hours of disturbing imagery that feels a little too close to what real life killers had done is a little heavy, especially considering the graphic nature of a lot of the themes.
Really wack, and until mid-late 2018, really hard to find too.