This video works.
Watch this ordinary guy shovel mounds of bone-dry corn starch into his mouth. A combination of six step tutorial and gratuitous chestpounding, this video is a simple example of the cornstarch (or flour) bomb.
A large suspension of combustible flour or cornstarch when sufficiently oxygenated can cause an explosion. Simple like that.
Flour mills, or corn storage silos have always been high risk locations. Go visit any of these kinds of facilities and you will see the lengths they go to in order to prevent sparks.
(We have done this experiment. The instructions are true. Careful. Cornstarch in your lungs is horrible. There are two guys demonstrating: one demo is clean: the slo-mo video of the other looks less "clean" to my eye.Wonderhowto. Embracing the long tail of curiosity.