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Some of the more tough flys take a few zaps before they drop down dead. I doubt it works with some of the bigger insects like cockroaches though, I flyback transtormer will probably zap them but that would smell really nasty.
That's quite true. I have done that before under controlled conditions. You can actually extinguish a lit match in gasoline, provided you can control the emanating vapors. Liquid gasoline will quench a fire, but the vapors will certainly ignite.