Elon Musk has blamed poor planning as the reason why the supposedly unbreakable windows of Tesla’s Cybertruck smashed during a botched launch event.
The firm’s chief executive told an audience in California on Thursday: “You want a truck that’s really tough, not fake tough.
“You want a truck you can take a sledgehammer to, a truck that won’t scratch, doesn’t dent.”
To prove it he then directed a Tesla designer to strike the door with a sledgehammer, resulting in no damage.
But when they threw a metal ball at the driver’s side window and it splintered, Mr Musk said: “Oh my f****** God.”
“Maybe that was a little too hard,” he added.
Mr Musk has since said on Twitter that the sledgehammer caused an unseen crack which led to the windows smashing when they were hit with the steel ball.
He wrote: “Sledgehammer impact on door cracked the base of the glass, which is why the steel ball didn’t bounce off.
“Should have done steel ball on window, then sledgehammer the door. Next time.”
Tesla has received 200,000 orders for its new electric pickup truck – despite the embarrassing launch.
Placing an order costs buyers $ 100 (£77), which Tesla says is fully refundable.
Tesla has said the Cybertruck, which starts at $ 39,900 (£31,000), will be in production in 2021.
Mr Musk saw more than three-quarters of a billion dollars wiped off his fortune after the embarrassing incident.