Elon Musk's tunnelling startup 'The Boring Company' has sold 10,000 flamethrowers so far, earning around $5 million. The $500 flamethrower, deemed the 'world's safest' by Musk, throws flames shorter than 10 feet, and was unveiled by the startup earlier this week. Notably, The Boring Company has only offered 20,000 flamethrowers for sale.