One horror story could be that the Keurig machine constantly clogged. People would try to clean it but it would clog again very soon, making it impossible to make a proper cup of coffee. It was really frustrating as they had to keep disassembling the machine.
Well, I heard of a case where a Keurig machine kept dispensing coffee that tasted really bad. The user tried different pods thinking it was the pods' fault, but the problem persisted. After some investigation, it turned out that there was some sort of mold or bacteria growing inside the machine, which was contaminating the coffee. It was really disgusting and the machine had to be thoroughly cleaned and disinfected, but even then the taste issue wasn't completely resolved.
To add a filter to a story, start by deciding on the criteria for what you want to include or exclude. Then, you can apply this during the planning and writing process. It could be based on character traits, plot points, or the overall mood.
You can usually find the comic filter option in the settings of the app or software you're using. Just look for something like 'filters' or 'visual effects'.
Well, it depends on what you mean by 'real'. Technically, there are AI-based tools and algorithms that can be applied to manga to achieve filtering or manipulation effects. But their effectiveness and accuracy can vary.