A video of a dog barking at "nothing" or a child laughing at an empty corner of the room.
Option 2: The "Ghost" in the Machine (Best for family or pets) If the video features a pet or a loved one: IMG_4391.MOV
The story follows your character retracing their steps across the city shown in the video to find the lock that matches the key. A video of a dog barking at "nothing"