It bugs me (no pun intended) how people in such cases readily suggest some kind of poisoning, intoxication, or mental meltdown. Hinting to numerous other comments in the thread. So, a word to all armchair psychiatrists out there, I have it on good authority that real psychiatrists first rule out whether the situation is real, then move on to delusional and paranoia explanations. Otherwise it would be very easy to conspire against a family member, poison them or get them locked up, and enjoy their fortune or sth. So it is a meme at this point, so joke is on me for responding seriously but at some point it has to be debunked. You have to rule out that the situation is not real before reach for the mental illness explanations.