Strange lights hovering over the water could be part of the story. Maybe they are the signs of some otherworldly beings living in the river. Also, there could be a story of a cursed object that was thrown into the river and now brings misfortune to those who get close to it.
One possible element could be a haunted bridge over the Willamette River. People might say that if you cross it at midnight, you'll see a ghostly figure.
Well, without knowing the exact 'willamette river horror story', it could be something related to pollution in the river that had some really bad consequences. Maybe the pollution mutated some fish or other creatures in the river into something terrifying. Or it could be a story about a group of people who went on a boating trip on the Willamette River and they encountered something truly horrifying like a sudden, thick fog that surrounded them and then they started to experience all kinds of strange things, like their boat being pushed by an unseen force and hearing screams that seemed to come from all around them.
Ghosts. Maybe the spirits of those who died in or near the Carbon River.
Ghosts could be a possible element. In 1928, superstition was still quite prevalent, and a horror story might involve the apparition of a vengeful spirit.
One possible element is a haunted location. The princess might live in a spooky castle filled with secret passages and rooms where strange things happen. Another element could be a malevolent force like a demon or a powerful sorcerer who targets the princess. For example, the sorcerer might use dark magic to make the princess see terrifying visions.
Ghosts could be an element. In many horror stories, ghosts play a major role. They can haunt a place, like an old building in Navsari, and cause fear among the people living nearby.
One possible element could be the use of his unique musical sounds as a trigger for the horror. His music often has intense and somewhat otherworldly beats that could be associated with something sinister.
The Detroit Horror Story may contain elements such as the isolation of certain neighborhoods. These areas, cut off from the rest of the city, can feel like a world of their own, full of mystery and danger. The presence of graffiti - covered walls and broken streetlights can add to the spooky atmosphere. There could also be elements related to the city's history of racial tensions, which could manifest in stories of hauntings or vengeful spirits.
The waiter himself could be a key element. He might have a past he doesn't remember, which is somehow related to the horror. For example, he could have been involved in a murder at the restaurant in a past life, and now the spirits are coming back to haunt him. Also, the customers could be strange, like they are not really human but some sort of otherworldly beings just pretending to be normal diners.
Malfunction could be one. Like when it doesn't stop vibrating or changes its pattern unexpectedly.
One possible element could be a creepy old mansion. It might be abandoned and full of dark corners where strange things happen.