According to Interesting Engineering's YouTube page:
The Boring Company received a strong and hilarious show of support from company founder Elon Musk. He capitalized on a running joke between him and the company: if the hat sales for his Los Angeles underground tunnel project exceeded 50,000, he mentioned that he would start selling Boring’s new flamethrowers. He made a short video to show customers its capabilities. With a combination of sarcasm and humor, Musk commented about the flamethrower: “Don’t do this. Also, I want to be clear that a flamethrower is a super terrible idea. Definitely, don’t buy one. Unless you like fun!”
What does Elon Musk know that we don't? Is there a zombie apocalypse coming??