Yes, flamethrowers. They do have practical applications. AFAIK, they are still legal in most of the free states right now. With that said, I'll post something new that I found to light up this thread.
exothermic.tech

Pulsefire® UBF (Underbarrel Flamethrower) - Exothermic Technologies
The first commercially available underbarrel flamethrower. Send a stream of fire 25 feet away with the press of a button!
