Not as cool as this, but I had a fun Claude Code experience when I asked it to look at my Bluetooth devices and do something "fun". It discovered a cheap set of RGB lights in my daughter's room (which I had no idea used Bluetooth for the remote - and not secured at all) and made them do a rainbow effect then documented the protocol so I could make my own remote control if needed.
I asked Claude Opus 4.5 to start trying to find undocumented API stuff for our endpoint management software so I could automate remediations and cut service desk calls and it found two I haven't seen before after trying for an hour. Since it's written in .net I'm fairly sure I could have told it to decompile it and find more fairly easily too.