Microsoft copilot would use emojis at the end of every single response, mostly smileys, and I discovered out if you told it you had PTSD from emojis and to not use them, it’d get stuck in a loop where it’d say of course it won’t use emojis, use them anyway, apologized, then after a few loops like this, it’d start doing this thing like it was a serial killer and it would type ONLY using the emoji versions of letters, and it would repeat phrases and I almost died holding in a laugh when I discovered this during a work call. One of the funniest things I ever discovered in old LLMs.