Well, that's a matter of personal opinion. Some people might consider it the worst due to certain plot points or character developments, but others might find something redeeming in it.
One of my worst days ever was when I missed my flight. I woke up late, rushed to the airport, but still couldn't make it. I had to pay a huge fee to reschedule, and then wait for hours at the airport. It was so frustrating.
In a worst day ever story, things like losing something important can be included. For example, losing your wallet with all your money and ID cards. It creates a lot of trouble and stress.
Well, my worst day ever story happened on a school day. I had forgotten to do my homework which was a big project. I got a really bad grade for it and on top of that, I tripped and fell in the hallway in front of everyone during break time. It was so embarrassing.
Well, it could be a day full of disasters like missing an important exam because you overslept and then realizing you also left your wallet at home so you can't even buy a meal. Just one thing after another going wrong.
One of my worst days ever was when I got sick during a really important event. I was supposed to give a speech at a big conference. But that morning, I woke up with a high fever and a terrible stomachache. I could barely stand up. I had to call and cancel at the last minute. I was so embarrassed and disappointed that I couldn't fulfill my obligation.
My worst Valentine's Day was when I had to work a double shift at a very busy restaurant. Everyone around me was celebrating with their loved ones, and I was running around serving people. I didn't even have time to take a break or eat. And to top it off, I got yelled at by a customer for no good reason. It was a truly miserable day.
One possible event could be getting fired from your job unexpectedly. It just shatters your day and makes you feel lost and worried about the future.
My worst day ever was when I missed my final exam. I overslept because my alarm didn't go off. I rushed to the exam hall, but by the time I got there, they wouldn't let me in. I felt so frustrated and disappointed in myself. It was a crucial exam that could have had a big impact on my final grade.
The plot might involve a person who is supposed to perform in a big show. They wake up with a sore throat and can hardly speak. Their costume is missing a crucial part. And during the performance, they forget their lines completely. The audience starts to boo and it's just a total nightmare of a day for the performer.
The 'worst day ever short story' could be about a person who wakes up late for an important job interview. They spill coffee on their only clean shirt on the way out. Then, they miss the bus and have to take a much more expensive taxi. When they finally arrive at the interview, they realize they left their resume at home. It's a series of unfortunate events that make the day extremely bad.