Fiction rather than non-fiction here, but I was messing about bouncing ideas off ChatGPT for a novel I'm sketching out, and asked it to suggest some additional characters based on the plot outline. One idea was that there could be 'a kindly nurse who works in the dementia ward of a nearby hospital'.

Which completely spooked me out as my wife is a nursing assistant who works with dementia patients at the local care home, which I had obviously not mentioned in that chat or any other.

Very weird. Maybe safer to stick to non-fiction after all!