What was that sound? It can be hard to tell if it was even something human. Prone to happen at night, or otherwise in the dark, especially in the Haunted House, the Abandoned Area and the like, all places where wandering off is probably foolish. Has a magnetic attraction for characters, even ones who are not the Fearless Fool. An opening not so innocuous as Follow the White Rabbit. Repetition, especially if no one ever figures out what it was, can turn it into Hell Is That Noise.
- In The Secret Garden, Mary hears a strange sound like crying. She is told it's the wind, or one of the servants crying, but she tracks it down and finds Colin.
- In one episode of Star Trek DS 9, Quark spends a shuttle trip trying to work out what a buzzing sound is that only he can hear. Turns out it is a bomb.
- Potter Puppet Pals toon "Mysterious Ticking Noise" features a mystery sound that isn't played for horror like Hell Is That Noise.
Hello, Unknown Troper. You'll need to get known to lend a hand here.