"y'know it's really hard to make a spear maybe i'll mine some metal and make a knife"
(possible mistake) defeated hyperintelligent world-takeover hyperintelligent aiborg sees abo person trying to make a knife AI: "oh hey if metal works then i can turn everybody into nanites again!" abo pulls away from metal abo: "oh! no! metal doesn't work anymore! nobody can use metal for anything!"
