So recently I was watching a film with my friend and we could both hear a high-pitched ringing frequency type noise at the exact same times and it just happened once it happened a good for five times and I always brought up every time I could hear it and she told me that they actually put these frequencies in the movie for a specific reason and I'm not sure of this reason as to what she said hypnotise that's what the world she is but I think that's a bit extreme but I was wondering if you guys know any more about this