In just 48 hours, billionaire entrepreneur and past Big Think Expert Elon Musk has sold over 4 million dollars worth of his brand new The Boring Company-branded flamethrowers.

As documented by The Verge, Musk has been keeping us all posted on his latest stunt via Twitter, and is currently on pace to sell through the limited stock of 20,000 flamethrowers later this week.

1,000 ordered already, only 19,000 left!

— Elon Musk (@elonmusk) January 28, 2018

The flamethrowers are sold at a perfectly affordable $500 apiece. Video of a gleeful Musk using his latest device was posted to his Instagram account over the weekend.

Musk’s latest stunt is itself built on a previous promise that if he sold 50,000 The Boring Company-branded hats, he would put his brand new flamethrowers on sale for a limited run. The milestone for the hats was easily reached at the beginning of December last year.

He has assured us he’s not selling the flamethrower for nefarious means:

The rumor that I’m secretly creating a zombie apocalypse to generate demand for flamethrowers is completely false

— Elon Musk (@elonmusk) January 28, 2018