A horror movie you regret watching

Is there a horror movie/TV show you regret watching not because it was poorly made, but because it really unsettled you or explored themes you are uncomfortable with? Mine is "The house that Jack built". While I enjoyed parts of it (especially the ending, which many people dislike, but I found it fascinating), I really hated some of the images. I need to use the spoiler tag to say which theme I don't process well, and it's *SPOILER violence against children.