Using an aerosol can, such as hairspray, with a match or lighter as a makeshift flamethrower. A serious case of Don't Try This at Home, because there's a very real risk that the flames will heat the canister up enough for it to rupture and …
Wow, calling my dad out for teaching me how to kill spiders with them when I was 3 and then sending me off with both the aerosols can and lighter. I killed 38 spiders that day.
Aerosol Flamethrower - TV Tropes