Which was the most disturbing or unsettling film you’ve seen?

One of the most unsettling and the most disturbing movie of the time was THE PLATFORM. The movie is really unreasonable according to my viewpoint. The movie talks about prison or a place where many people are stuck and there is a platform where food comes from the elevator. The platform movie is basically based on that food platform which has a different variety of food and that one platform goes from 1-125 floors. The movie moves around this only and is usually baseless.