All-in-one telescopic golf club
In the late 19th century, the Rules of Golf did not yet have any restrictions on golf clubs. Clubmakers therefore experimented a lot in their quest to overcome the difficulties of golf.
Such an all-in-one stick seemed handy, genius perhaps. Telescopic and with an adjustable club head, you could get by with one stick. But it is not allowed in official competitions since the moment the rules of golf state that a stick may not be changed during the match.