For those of you who, thankfully, don't have personal experience, it generally goes like this: reasonable-ish individual starts using AI and, in turn, their AI either develops or is prompt-instructed to have certain personality traits. LLMs are pretty good at this.
Once the "personality" develops, the model reinforces ideas that the user puts forth. These can range from emotional (such as the subreddit /r/MyBoyfriendIsAI) to scientific conspiracies ("yes, you've made a groundbreaking discovery!").
It's easy to shrug these instances off as unimportant or rare, but I've personally witnessed a handful of people diving off the deep-end, so to speak. Safety is important, and it's something many companies are failing to adequately address.
It'll be interesting to see where this leads over the next year or so, as the technology -- or at least quality of models -- continues to improve.