The tech tycoon began teasing his "little friend" by posting two videos of the ironically named Boring Company's fiery weapon in action to Instagram.
He hyped it more with with a series of cheeky tweets, one of which included a link to its web page.
Three hours later, Musk announced that the first 1,000 had been ordered.
His last update indicates that 10,000 of the 20,000 available flamethrowers have already been purchased.
The Verge crunched the numbers and determined that at the $500-per-unit price point, total sales have generated over $5 million in revenue for The Boring Company in less than 48 hours.
Additionally, the presale of 3,000 branded—and admittedly overpriced—fire extinguishers for $30 each adds about an extra $100,000 to that figure.
If you're planning on buying one of Musk's flame-spewing toys, don't sleep on it. Our guess is the remaining 10,000 will sell even faster.