The poster effectively matches the title of the film "The Possession" by showing a hand coming out of the mouth and taking control of the face, hinting at the horror to come. Below the title, the tagline "Darkness lives inside" links to the image and creates intrigue about what will happen. Including the line "Based on a true story" makes the film scarier by implying such events could happen to ordinary people. The mix of white and black/grey backgrounds in the poster further suggests normality being invaded by danger.