Financial problems often play a role. Some scientists are so dedicated to their research that they forget about their own financial stability. They may struggle to get funding for their projects and end up in debt or poverty, like Nikola Tesla. And also, sometimes the society's values can be a factor. If a scientist's ideas go against the mainstream beliefs at that time, they might be ostracized. Take Galileo Galilei for instance. His heliocentric theory was against the Church's dogma at that time, and he faced a great deal of trouble.
Personal tragedies can also contribute to a sad story. A scientist might experience the loss of a loved one which could disrupt their work and mental state. Or they could be in an unhealthy working environment, facing bullying or discrimination from colleagues or superiors. In the case of Rosalind Franklin, there were disputes over the credit for the discovery of the structure of DNA, and she faced some degree of discrimination in the scientific community, which was really sad considering her important contributions.
As I don't know the details, it could be an illness like cancer or a heart disease.
One possible cause is that he has been betrayed by someone he trusted. It could be a business partner who cheated him out of his money or a friend who spread false rumors about him. This kind of betrayal can be really devastating and lead to a sad story.
One sad story is about Nikola Tesla. He was a brilliant scientist but faced many hardships. He had amazing ideas like alternating current, yet he was often overshadowed by Edison in terms of public recognition. Tesla died in poverty and relative obscurity, despite his contributions that revolutionized the world of electricity.
She might have had a sad story related to her family. Her family didn't support her singing career at first. They thought it was a waste of time. She had to fight against her family's wishes while also trying to succeed in the competitive music industry. This internal struggle and lack of family support could be a big part of her sad story.
It could be that the biker is ostracized by the biking community for some reason. He loves biking but no one wants to ride with him or accept him. This would make him feel lonely and sad while still having a love for biking.
Territory disputes often lead to animal rumble grumble. For example, male deer will grunt and make noise to warn other deer to stay away from their area. They do this by making a series of rumbles and grumbles that signal their dominance and ownership of the land.
It could be abandonment. Maybe Crumpet's owner moved away and left it behind.
Maybe it's about the mother losing her child, like in a tragic accident. For example, a car accident took away her little boy, and she was left with only memories and grief.
Maybe in the sad bacon story, there was a farmer who had a special pig named Bacon. He raised this pig with love, but then an unexpected disease hit the farm and the pig had to be put down before it could be turned into bacon. The farmer was sad not only because of the loss of the pig but also because of the lost opportunity to make bacon from his special pig.
In a sad lego story, there might be a situation where a Lego project was ruined by water. Say a child left their Lego creation near a window during a rainstorm and the rain came in and made the Lego pieces soggy and unusable. It would be a sad situation for the Lego enthusiast.