I saw this movie on late night TV back in the early eighties, so it was probably made in mid 70s. I remember a scene with the child sitting on the man’s lap, while man held blade close to kids throat. (This part is going to sound weird): I remember the movie cutting away to these black and white sequences with a bunch of weird guys in masks. Does this sound familiar to anyone, or am I maybe mixing two movie memories. This has been driving me nuts for decades, and any internet searches of babysitter movies have turned up negative.