3-sec noisy fart powers Musk's 'flying' car: Ex-Meta Chief AI Scientist on Musk's 'fart' reply. Ex-Meta Chief AI Scientist Yann LeCun hit back at Elon Musk amid their online feud over 'flying' Roadster 2. "I fart in your general direction," Musk had said after LeCun called his car "crappy". "From a high-pressure belly, your fart might propel you upward and forward...That's exactly how your car is powered: A 700-bar, 600-litre, three-second, noisy fart," LeCun replied.