Threats where the audience and characters never actually see their physical shape, face, or form. Invisible or shapeshifting threats should count.
  
1. **Bird Box (2018)** - The creatures in Bird Box are malevolent, unseen entities that drive humans to immediate, violent insanity and suicide upon being viewed.  
  
2. **It Follows (2014)** - It is a supernatural being that incessantly pursues its victims at a walking pace. It is the result of a curse that was created through unknown means. A person who possesses the curse will be stalked endlessly by the entity until it kills them. The curse can be passed onto someone else by having sexual intercourse with the person. The Entity constantly changes its form in spite of its tightly limited audience. It can look like any human being including known existing associates of the cursed but its true form was never revealed.  
  
3. **The Happening (2008)** - An airborne, completely invisible neurotoxin released by plants causes mass chaos, represented only by the sudden rustling of the wind through the trees.  
  
4. **Harry Potter** - A Boggart is a shapeshifting, amortal creature in the Harry Potter universe that instantly transforms into the deepest, darkest fear of whoever is looking at it. Because its form depends entirely on the observer's mind, no one knows what a Boggart looks like in its natural state.

Faceless threats.