One possible plot could be that a person wakes up in the morning thinking it's a day of good luck. But as the day progresses, they start to notice strange things. Every so - called 'lucky' event is actually a setup for something more sinister. For example, they win a free trip to an old, abandoned hotel. Once there, they realize that the 'good luck' was a curse to draw them into this horror - filled place where they are haunted by the ghosts of the hotel's past victims.
A plot might be that a girl is told she'll have good luck all day. She finds money on the street and gets a promotion at work. But then, she starts seeing a shadowy figure everywhere she goes. It turns out that the 'good luck' was a bribe from a malevolent spirit. The spirit wants her soul in exchange for the good fortune and starts to torment her, slowly taking away all the good things that happened that day, leaving her in a state of horror.
Perhaps the character manages to fight back against the source of the horror. They use the very good luck that was supposed to doom them to their advantage. They find a way to reverse the curse and turn the tables on the evil entity. So, instead of being a victim, they become a hero who has overcome the false good luck and the horror associated with it.
It could be that in the '19 horror story', there are 19 victims of a serial killer. The killer has a very strange and terrifying modus operandi. He leaves a mark on each victim that is related to the number 19, and as the story progresses, the police are trying desperately to catch him before he gets to his 19th victim.
Another plot for the day 399 word story could be a writer who has been struggling to write a novel for 399 days. On this day, he has a sudden burst of inspiration while looking at an old photograph. He starts typing furiously and finally begins to see the shape of his long - awaited story emerging.
Maybe it's about a family going on a picnic on that sunny day. They pack their favorite foods, like sandwiches and fruits, and head to the park. There, they enjoy the warm sun while playing frisbee and lying on the grass.
A good luck day in a story could be when everything goes smoothly for the main character. They might get a job they wanted, meet a helpful person, or find a valuable item by chance.
A mad doctor gets hold of endoskelal samples and tries to transplant them into human bodies. But the endoskelal has a mind of its own. The patients start to transform into half - human, half - endoskelal monsters and go on a rampage in the hospital, attacking the staff and other patients. It becomes a bloodbath as the endoskelal - influenced creatures spread horror throughout the building.
Maybe in a small town, there is a legend about a cursed field. Whenever sheep graze there, they become violent and attack the townspeople. A young boy doesn't believe the legend and takes his family's sheep to graze there. Soon, the sheep turn on him and he has to run for his life through the town, with the blood - thirsty sheep in pursuit.
One possible plot could be centered around Oppenheimer's life during the Manhattan Project. In this 'horror story', there could be elements of scientific hubris. Maybe there were unforeseen and terrifying side - effects during the experiments. The story could also delve into the political pressure and ethical dilemmas he faced, which are presented in a way that gives the whole narrative a horror - like atmosphere. For instance, the secrecy and the fear of the power they were creating could be personified as some sort of lurking menace that haunts Oppenheimer throughout the story.
A family inherits a large sum of simoleons. But every time they use one, something bad happens. For example, if they buy food with a simoleon, the food turns rotten immediately. If they try to pay for a repair with it, the thing they were trying to repair breaks even more. The simoleons seem to be a curse that brings misfortune instead of wealth.
A scientist creates genetically modified apples. These apples start to grow at an abnormal rate and take on a life of their own. They start to roll around on the floor, attacking people by bouncing into them and knocking them unconscious. Then they secrete a strange liquid that starts to dissolve the flesh of their victims.