Now this is a smart, sensible idea for pest control. While you're at it, why don't you get that mouse crawling inside your wall with a grenade?
I bet this is one of those inventions that had another purpose first and later found out it was great for something else.
It looks to me like that guy is trying to burn off and eliminate a bad fart. While doing so, one night, he realized the mosquito population in his room was decimated rather quickly.