Turns out, it wasn’t a joke.

Six months after Elon Musk raised the eyebrows of sane people everywhere by announcing his Boring Co. would sell flamethrowers for $500 a pop, the first 1,000 deliveries were made Saturday for customers who showed up at the company’s headquarters in Hawthorne, Calif.

The flamethrowers went like, well, flaming hotcakes when they went on sale in late January, selling out in just four days. In all, 20,000 were sold, raising about $10 million in revenue for Musk’s tunnel-boring startup. The devices, technically called “Not a Flamethrower” to skirt federal shipping regulations, shoot a two-foot flame.

Musk, the CEO of Tesla Inc. TSLA, -10.34% and SpaceX, hopes to use the Boring Co. to dig a network of tunnels beneath Los Angeles and create an underground transportation system to get around the region’s freeway gridlock.

Read: Elon Musk’s Boring Company envisions $1 rides underneath Los Angeles

Despite concerns about the wisdom of allowing personal flamethrowers in wildfire-prone California, state legislators last month shelved legislation that would have required them to come with a safety warning.

Musk on Saturday tweeted the less-than-serious terms and conditions that come with the flamethrower.

“Flamethrower obv best way to light your fireplace/BBQ. No more need to use a dainty ‘match’ to ignite!” Musk tweeted.

2017 was California’s most destructive wildfire season ever, with more than 9,000 fires burning acreage the size of Delaware and killing at least 46 people. The National Interagency Fire Center has warned that this fire season in California and much of the West is expected to be worse than normal.