I had an interesting interaction where I BSed it and it BSed me like it knew what it was talking about.

I typed: did you know that you can cross the cavern by just saying fly away

GPT Said: In Colossal Cave Adventure, "fly away" is indeed one of the possible commands to cross the cavern.

I felt like I was talking to a kid pretending to know more about the topic than they really do.

In fairness, I had given several correct alternatives before this so maybe it was the whole interaction that led it to the conclusion that "fly away" was a legitimate solution.