Deep fakes: the uncanniest variation of manipulated media content so far

In an age when we so heavily rely on the media for our sense of reality and our idea of the self, a phenomenon such as deep fakes is bound to evoke unease: a perfect illusion, projecting the strange into what is most ordinary. Deep fakes are certainly not the first occurrence of manipulated media content, so what fuels this extraordinary feeling of uncanniness we associate with them?