Elon Musk had hinted at his dream for a battery-electric pick-up truck for years before the prototype for his Tesla Cybertruck was unveiled.

The futuristic vehicle, with its trapezoidal silhouette, would not be out of place in a science-fiction film, and the base version of the truck was slated to cost a cool $US39,900 ($60,000). Fashioned from the same stainless steel alloy used for SpaceX rockets, the car was "literally bulletproof", according to the billionaire.

But at an event launching the design in Los Angeles six years ago today, a designer threw a metal ball at the car's windows and they cracked.

"Maybe that was a little too hard," said Musk, who also claimed the doors could withstand bullets.

Hundreds of thousands of people were undeterred by the cracked windows and promptly p

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