Saying a TV show is "so good it's scary" is usually a figure of speech. With Netflix's hit sci-fi drama "Black Mirror," it takes on a far more literal (and terrifying) interpretation.

"This is futurism for futurists," Dylan Hendricks, program director of the Ten-Year Forecast at the research organization the Institute for the Future, told Business Insider.

Part of what makes "Black Mirror" so unsettling is that its episodes take place in worlds that could easily pass for our own, save for some leaps in technology.

Curious just how big those leaps might be, Business Insider spoke with Hendricks about which of the show's 19 episodes are closest to becoming reality.

Warning: Spoilers ahead for "Black Mirror."