The npub1zfux5ems9jjy3422d09d0eug92rg036dqn08mwevum9g4u7gf9gsn7uf07 (npub1zfu…uf07) Messages magic compose beta is quite interesting, and somewhat funny, if not particularly useful at the moment. One interesting glitch is that the AI sometimes seems to think you're talking to it, rather than to the other party in the conversation.
It can also, apparently, be driven to extremes if you insult it directly.