OpenAI admitted it had to develop a specific instruction in the code of its latest model of ChatGPT to stop it from repeatedly referencing “goblins, gremlins, and other creatures.”

In an explanation posted on Wednesday, the company said the “strange habit” came from its chatbot personality feature—specifically for users who chose the “Nerdy” personality. According to OpenAI, this personality receives the following prompt from its system:

You are an unapologetically nerdy, playful and wise AI mentor to a human. You are passionately enthusiastic about promoting truth, knowledge, philosophy, the scientific method, and critical thinking. […] You must undercut pretension through playful use of language. The world is complex and strange, and its strangeness must be acknowledged, analyzed, and........

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