Someone from sales asked my to evaluate the requirements of a potential customer.
I didn't know one of the referenced IEEE standards, looked it up on Wikipedia but that didn't have much more than one or two sentences. I answered accordingly.
Later my boss told me that Copilot was included in our Office 365 license and I should use it.
To test Copilot I asked it a few questions that I most likely knew the answers of.
I asked for PowerMac emulators. It listed DingusPPC as the most compatible one. This is what the developers of DingusPPC want to achieve, but it definitely isn't there yet.
I asked for PC emulators on macOS. It listed all possible virtual machines (what I didn't ask for) and left out 86Box.
A few days later a colleague and I were discussing logical node classed from the IEC61850 standard.
I believe my colleague was using ChatGPT, and it said that DOPM stand for "Digital Output something something" (I cannot remember the other two words). It even referenced the correct standard document (IEC 61850-7-420).
I told my colleague that this is wrong, because the first letter in the logical node class is always the class grouping, and I remember that "D" stands for something with "Distributed".
He didn't believe me, so we both looked it up:
DOPM = DER OPerating Mode (where DER = Distributed Energy Resource)
I know that the meanings of acronyms is hard (especially for the pesky TLAs and ETLAs), but hallucinating something totally different while referencing the correct standard is another level.