One common type is getting the wrong length. Like when someone asks for a few inches off and ends up with half their hair gone. Another is bad layering. It can make the hair look really choppy and unflattering. And then there's the issue of color disasters. Sometimes the dye job turns out completely different from what was expected.
Well, I once read a story on BuzzFeed where a girl asked for just a trim but ended up with hair so short it barely reached her ears. She was devastated as she had been growing her long hair for years. It was a total miscommunication between her and the stylist.
One common element is miscommunication. Like when the customer and the stylist don't understand each other clearly about the style. Another is inexperience of the stylist. For example, if they are new and not very skilled at cutting hair.
Misrepresentation is a common one. Like when someone lies about their job or appearance. For example, saying they are a successful entrepreneur when they are actually unemployed, or using a really old and flattering photo on their dating profile.
Jealousy is a common theme. For example, a partner getting jealous over every little interaction the other has with someone of the opposite sex.
One common element is the shock of a new look. People often have an image of themselves in their minds and a short haircut can completely change that, leading to horror. For example, if someone is used to hiding part of their face with long hair and then the short cut reveals everything.
Another is the administrative horror. For example, when teachers are not given enough resources or when they are overloaded with paperwork and bureaucracy that takes away from their teaching time. This can be really frustrating for them.
The teacher who is unprepared is also a common horror story. They would come to class without proper lesson plans, so the class time would be wasted. Maybe they would just make the students read from the book the whole time without any real teaching. Also, teachers who are overly critical and find fault in everything a student does, from how they hold their books to how they walk in the classroom.
Food contamination is quite common. Like the time when someone found a piece of plastic in their soup. It was a real shock for the diner.
One common element is the stylist not listening to what the customer wants. For example, asking for long layers but getting blunt cut instead. Another is bad technique like uneven cutting or using dull tools. Also, unexpected changes like a wrong dye job or a cut that is way too short without permission can be common in these stories.
Verbal harassment is common. For example, using harsh and demeaning words to put someone down. Another type is power - based harassment, like a boss using their position to intimidate an employee into doing something they don't want to do.