The character doesn't know it, but someone is standing in the back of the frame. Only the audience notices first, and they want to shout "Behind you!"
When hiding a threat behind a conversation or an everyday scene. Don't draw big attention to it with music or a zoom.
Background reveal, a woman in the foreground cooks pasta in a bright kitchen and hums, while far behind her through the open hallway a pale figure slowly steps into a dark doorway, deep focus, locked-off camera, 35mm lens, warm light in front and cold light behind, eerie mood, 6-second shot.
deep focus wide shot, two friends chatting on a sunny school field in the foreground, far in the background a pale figure walks slowly straight toward the camera, nobody notices, everything sharp
It Follows (2014) — The director said that besides the obvious scenes, he put easy-to-miss figures in the background (Den of Geek interview)
Den of Geek — It Follows: David Robert Mitchell Discusses His Terrifying Horror Movie
Not verified