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By James Eng

Someday, Tesla owners could have their electric cars charged by a metal snake. For realz.

Tesla Motors on Tuesday unveiled a video showing a prototype of its automatic charger in action. In the video, a flexible, snake-like metal appendage slinks and slithers before inserting its nozzle into the charging port of a Model S.

Tesla CEO Elon Musk teased the automatic charger last December, when he tweeted that the electric-car company was working on a "solid metal snake" charger “for realz.”

A bit unsettling, you say? The creepy factor wasn’t lost on Musk, who has often railed against the dangers of unsupervised robots and artificial intelligence.