Start by listing all the possible bad things that could happen. Maybe the character wakes up late, has a fight with a loved one, and loses an important item. Then, build the tension as these events pile up.
Well, in a Twilight fanfic, a single moment can trigger a chain of events that completely alters the story's direction. Maybe it's a decision made by a character or an unexpected encounter that sets everything off.
One common reason is relying too much on tips and rumors instead of doing their own research. Another is not having a well-defined trading strategy and sticking to it. Sometimes, unexpected economic events or policy changes can also catch day traders off guard and result in total losses.
Well, I don't actually know the specific 'the day everything went wrong story'. But generally, it could be about a day when a person woke up late, missed the bus, then got to work or school and found out they had forgotten an important assignment. Maybe they spilled coffee on their clothes during lunch and later got into an argument with a friend. It's all about a series of misfortunes that happened in one day.
One possible element could be bad weather. If it's pouring rain and you don't have an umbrella, that can start a series of problems. Another could be miscommunication. For example, getting the wrong time for an appointment. Also, technical problems like a phone dying when you need it most.
It could be a series of unfortunate events like missing an important appointment, having a fight with a loved one, and losing something valuable all in one day.