Fire breathing is awesome, but it can be super-dangerous. However, with a few household ingredients, you can safely do it yourself!
How it works:
A mass of corn starch will not easily burn (try it), but when you disperse the starch into a fine powder you can ignite it as a fuel. Starch, like sugar or flour, is a carbohydrate and can be burned. In fact, the dust burns instantly. If you've heard of a grain elevator explosion, this is the most common cause. (quoted from about.com)
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