Solvent
Because we are behind the lens with the narrator for most of the film, Solvent feels more like an experience we’re a part of than a movie we’re watching, especially with the documentary point of view it takes.
While the references to the horrors perpetrated by the Nazis was nauseating enough, the film style about 2/3 of the way through makes it literally physically true - I had to look away a few times to reorient myself, and this, for me, is what lifted Solvent out of the pack of other found footage/mockumentary style horrors which are so popular right now.
Also, and I cannot stress this enough, CAT COOKIES!