horror story
US /ˈhɔːr.ər ˌstɔː.ri/
UK /ˈhɔːr.ər ˌstɔː.ri/

1.
a story intended to frighten, shock, or disgust
:
•
She loves reading horror stories before bed.
•
The movie was a classic horror story with a twist ending.
2.
a very unpleasant or shocking experience or situation
:
•
Getting stuck in traffic for three hours was a real horror story.
•
His first job interview was a complete horror story.