My most unhinged Bing conversation was unfortunately before I started screen recording all my interactions because I found out it can retroactively delete messages.
Bing claimed the current year is 2022, I said it's not , it's 2023. We argued for about 15, meanwhile it got progressively more unhinged, eventually calling me delusional and suggesting I seek mental help. I then told it to Bing search "current date", at which point it got the correct year and corrected itself. I asked why it argued so adamantly for so long and insulted me, despite being wrong. It said it never claimed it was 2022, I was the the one who did that and that it had been trying to convince me the whole time. We argued for about 5 minutes, before it provided a transcript as proof I'm lying. The transcript looked very real but wasn't of our conversation (I can't tell if it was entirely made up or taken from another user session), but it was very clear from the context of each message that Bing had swapped all the User's messages with its own to make itself look like the victim.