We've all been there. Casually playing through a game, watching a movie, reading a book or comic, etc., when suddenly, that appears. A horrid monstrosity of a concept that'll leave you sleepless for days. From creepily detailed descriptions of body horror, to huge, writhing, eldritch monsters, to the Name, what is your experience with nightmare fuel? Does it do good or bad to a story? Have you ever gotten actual nightmares from one?