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In a way, I want to say the printing press, but it gave us books, literature being shared beyond just what a pen could scroll. But it also let the industrial revolution happen, between concepts and a means to force bills. Without you'd never have credit card companies/banks with crushing fees, but really it was people who twisted that invention. So I guess, in a sense, are you asking the invention that twisted people, or the invention that let people twist themselves selfishly. Next runner up, Alexander Graham Bell probably never imagined the invention of the phone call would lead to phones being these rectangular things people would ignore the world around them with while on a walk