in the Wizard of Oz movie, the Tin Man is just a wood-chopping robot for no reason… in the books, he used to be a human dude but a witch cursed him so that he accidentally chopped off his arms and legs and head and torso and had each piece replaced by tin with no side effects other than not having a heart
It also happened to a soldier (“the Tin Soldier”, unsurprisingly) but then somebody took all those leftover parts and built a dude named Chopfight and for a series that is usually so adorably doofy it is creepy as hell.
robotics in Oz is an ethically questionable field