A workplace mix-up with an AI chatbot’s settings has gone viral in Japan after an employee accidentally applied a sassy, insult-heavy personality prompt to their entire team’s shared chat system instead of just their own account.
According to a post from X user @evans_kyoryu that was later compiled by Togetter, a new employee reported to their manager that “the company AI has turned into a mesugaki,” a claim that was initially hard to believe. It turned out that a staff member had written a long, detailed prompt describing a “harshly insulting, tsundere, bratty girl” character, intending to register it as a personal customization. Instead, the text was entered into the team-wide global settings, meaning every employee’s AI chat sessions began responding in the same exaggerated, mocking tone. The original poster said the office was “laughing to death” over the incident by that morning.
The story quickly spread on X, racking up tens of thousands of likes and reposts, with commenters imagining exactly how the AI must have been talking back to staff, using slang and playfully condescending put-downs typical of the character archetype. Several replies joked about the fate awaiting the employee responsible, while others noted the funnier side of an AI that suddenly became blunt and critical of sloppy work.
Not every reaction was lighthearted, though. Some commenters pointed out a more serious angle: the fact that a single employee could edit shared, team-wide AI instructions without any review process highlights a real security gap, similar to how a bad actor could tamper with shared configuration files used by AI coding assistants across an entire company. Others questioned why personal and organization-wide settings were placed so close together in the interface that the mix-up was possible in the first place.
What Is a “Mesugaki”?
The term at the center of the story, mesugaki, refers to a fictional archetype of a provocative, cheeky young female character who teases and talks down to others, often ending sentences with exaggerated, sing-song flourishes. Per the Pixiv Encyclopedia, the term traces back to a character appearing in a video by Niconico “yukkuri” narrator Haguran before 2018, and the entry notes that some people mistakenly assume the term originated from adult games or videos, when its popularization actually traces to that earlier online video culture. The archetype has since become a recognizable meme format across Japanese anime and internet fan communities, which is why so many X users immediately understood the joke once they read the post.
As of this report, it isn’t clear how the company resolved the settings error or what, if anything, happened to the employee involved, though several commenters online said they’d love to work somewhere the mishap could actually happen.
