It took Elon Musk four days to turn a practical joke into a $10 million gag. Featured Video The business magnate sold out of his Boring Company-branded flamethrowers about 100 hours after putting them up for sale. Having sold 20,000 at $500, Musk raked in a handsome $10 million (minus expenses), money he could desperately use to help Tesla build more cars or continue his quest to create an underground high-speed transit system. Musk posted his accomplishment on Twitter Wednesday night. He then generously threw in a free fire extinguisher, suggesting the “World’s safest flamethrower!” may not be safe after all. Or maybe nobody spent the extra $30 and he ended up with a warehouse of extinguishers that are too small to help with a failed Falcon Heavy launch. Additionally, Musk announced that each flamethrower will come with a serial number as if they were pieces of art. Advertisement