If only high school
Vat19 shows us what happens when you drop a harmless little gummy bear into a vat of boiling Potassium Chlorate:
YouTube/Vat19
Poor guy.
An online lecture demo from the University of Massachusetts Amherst explains that "the thermal decomposition of potassium chlorate produces potassium chloride and an excess of oxygen, which is sufficient to ignite the gummy bear." The heat decomposes the potassium chlorate, which causes the combustion reaction.
But that's just a tiny gummy bear.
What about the world's largest gummy bear?
YouTube/Vat19
It's 5lbs and the size of a human head, basically.
YouTube/Vat19
Don't try this at home.
YouTube/Vat19
You can watch the full video from Vat19 below: