Amid an ongoing national debate over gun reform and the Second Amendment, some took issue with the fact that such unsafe machines were sold for a mere $500 by the Boring Company, which did not require a background check of would-be flamethrower owners.
As shown in Musk's tweeted pictures, hundreds lined up at the pickup site in Los Angeles to get their purchases and pose for pictures as flames licked out from the flamethrowers' barrels. But after he put his dreams into reality by offering 20,000 pre-orders at $500 a pop, they sold out in just a matter of days, raising $10 million for The Boring Company.
What started as an online gag has turned into a marketing ploy worth millions - with the first 1,000 customers receiving the flamethrower - that promotes the Boring Co., Musk's endeavor to build underground transportation tunnels.
As the promotional device started to land with customers, Musk posted a safety warning to customers on Twitter, stating: 'Please use as directed to avoid unintentionally burning things down. "I will not use this in a house".
With 20,000 flamethrowers now in circulation, expect more flame-throwing displays on social media.
While the merchandise certainly helps draw attention to Musk's boring ambitions and the holes he's drilling into Los Angeles streets, they're not how he's subsidizing most of the projects.
Ahead of the original launch of the gun, he said: 'When the zombie apocalypse happens, you'll be glad you bought a flamethrower. "Works against hordes of the undead or your money back!"
The billionaire said his company will ship a so-called "ice blaster" before the winter.
Musk was happily tweeting away from the so-called "pick-up party".