糖果與不明化學物質混合後起火?(有影片)

Hot Potassium Chlorate KClO3

It's a storng oxidant so if you heat it up, it can mimic respiratory combustion.
Ref: http://en.wikipedia.org/wiki/Potassium_chlorate

A longer demonstration here:
http://www.kentchemistry.com/moviesfiles/Units/Energy/GummyBearKClO3.htm