Peeping Tom is a 1960 horror classic that successfully meshed serial killing with portable hidden cameras. Think Dexter but instead of being a charismatic and relatively normal (on the surface) serial killer who hunted bad guys and took a sample of their blood as a trophy, Peeping Tom's killer was a reclusive porn addict who killed only women and his trophies were home-made films of them in their dying moments. Just describing that was creepy and weirdly perverted, which is probably why the film caused quite a stir back in the 60's. Critics couldnt stomach the complex serial killer protagonist, the home-made film aspect felt inappropriately meta, and audiences just didnt get (or couldnt sit through) the films underlying voyeuristic themes. Even the concept of the film would be considered pretty damn creepy today, which is why the film's tepid reception ultimately destroyed the director's career. It has only been in recent years that the film has been re-evaluated and deemed a horror masterpiece.