I am somewhat free styling going off the top of my head riding in the direct moment, but I would definitely venture to say as truthfully as is possible that body horror is either the number one or number one A. most terrifying form of horror for me. And for today I'm going to do a sort of a double feature of 2 scenes that I think represented the best of this sort of sub genre within horror. Heck even within body horror, because there are different kinds and types for example; the sort of corporealistic body horror of a Cronenberg, or in another case the mirror touch synesthesia that comes with watching someone have their Achilles tendon sliced. In these cases the body horror is one of a psychotic kind as well as a physical possession of sorts. The kind of possession that leads to the loss of control of one's own body and then begins to look and feels as if damage is being inflicted upon that person's body merely by the act of being watched. I think the easier part for an actor to perform (and in I say this with an air of relativity) is a production of the effect of just the possession and of itself the entry of something foreign into the body. This is mostly an action, and can be reproduced to the audience through a strange or unfamiliar dance move, or a combination of some form of jerking, or convulsing simulating to the audience that something foreign has entered possession of your body. The harder part, the part that I think both these actresses the legendary Isabelle Adjani, and Alexandra Essoe execute is the indication that you yourself, the owner of the body is still there, as well as the foreign invasion, because that is where the deepest fear is at, or at least that's the case for me. When done well you can look into the actor's eyes and feel like they are still there, afraid, fully aware of what is going on but unable to do anything about it because that the entity is too strong , the feeling to seductive, or enticing. There is a real terror behind possession, in my opinion, it's not merely something taking over. Without your knowledge that is scary in and of itself, but I think when we can identify with a feeling of complete powerlessness, being awake and held prisoner inside our own bodies, aware of what is going on and yet out of control, I think that's a few layers deeper in the psyche. As far as the actor, it becomes their job to kind of take on a form of double mindedness . In essence, they're playing 2 roles with their body when they have to disconnect the mind a little bit from the body, disassociate. You have to produce this kind of air or feeling that has no exact definition,in experience but what the actor can imagine, and reproduce this for the audience. In 1981 “Possession” and the lesser known but absolute gem “Starry Eyes” (2014) we see two actors who provide us with both the body horror in the physical nature and the horror that lies in a more cognitive nature, the consciousness, the awareness. The recognition that you're going somewhere else.