Apple updates Siri with quips about 'Back to the Future Day'

"Happy Back to the Future Day. Let me know if you need airspace directions for your hovercar," one potential answer says. In another Siri comments, "Well, they were right about the 'antique computer' thing..."

Oct. 21, 2015 is the date characters Marty McFly and Doc Brown travel to in Robert Zemeckis' Back to the Future Part II. The movie famously depicted 2015 as being more advanced, with technology like hoverboards, flying cars, and hologram signs.

It simultaneously missed out on inventions like smartphones, and contained things that are now all but anachronistic, like payphones, printed news, and fax machines.

Some things it did predict accurately were drones, fingerprint readers, flexible screens, voice-controlled TVs, and smartglasses.

Apple occasionally updates Siri with cultural references to keep it entertaining. One of the earliest examples was 2001: A Space Odyssey, allowing people to quote lines spoken to HAL 9000.