I gotta go with nunchuks. Anything you sling around on a chain seems silly to me. It seems like nunchuks are only good weapons against the unarmed. Anyone else has more range, usually something sharp in play and there isn’t a limp chain in the middle reducing the force of your strikes.
If it counts, my pick is railway artillery guns. They’re super impractical and inaccurate, and extremely vulnerable to being attacked and disabled. They use way too many resources for the impact they have. But on the other hand I absolutely understand why they were built, because man has always wondered: “what if we just make the gun bigger?”
They seem fun