I have an idea for a new SCP. It would be a cassette tape in an old 1990's walkman. When an someone pushes play on the tape and listens to it, a new recording plays each time. The recording is of an older sounding man, narrating a portion of your past using very descriptive and visual language. Each time the tape plays, it plays another new event. They can range from things as simple as what you had for breakfast and what you were thinking, or some traumatic event from your childhood. The man speaking is always the same guy, but there are no clues to his identity.
People who listen to it react as expected. They might act a little confused or amused that someone dictated a portion of their life. They might start crying as their memories are played back more beautifully than they themselves can remember. Or they might react very negatively if this was an event/memory that they have been trying to keep secret.