DIY Explosion FX (How I Make & Use a Creamora Fireball)
How to make Black Powder: http://grassrootsdiy.com/black_powder.htm
This shows how to build a simple creamora(fireball) and safely use it. There are many filming techniques, you'll have to figure them out on your own.
Yes I know I have an awesome wagon. No it doesn't really have much of a purpos