0-3 sec: An ordinary hallway. Beige walls, flickering fluorescent light. A wooden door stands closed

0-3 sec: An ordinary hallway. Beige walls, flickering fluorescent light. A wooden door stands closed. A shadow slides along the wall, moving toward the door. 3-6 sec: The door keyhole stretches. It widens like a yawning mouth. The wood grain twists into lips. The shadow pauses. Too late. 6-9 sec: The door lunges. The keyhole mouth opens wide, inhaling the shadow in a single silent gulp. The hallway dims. The door chews once. 9-12 sec: The door swallows. Its wood grain settles. A moment of stillness. Then the keyhole puckers. A small puff of dust escapes. 12-15 sec: A moth flutters out of the keyhole. It is pale, almost glowing. The moth flies away. The door returns to normal. Hallway lights flicker back. Fade to black. Sound: Soft creak, swallowing gulp, gentle fluttering, small burp, silence.