Sheldon,
My version of this involved a 55 gal burn barrel and a rubber balloon.
(1) Inflate balloon using a mixture of acetylene and oxygen from nearby cutting torch.
(2) Tie a 4 foot piece of bailing twine to the neck of the balloon
(3) dip the entire length of said twine into some kerosene
(4) Lower said balloon into a cold 55gal. burn barrel, leaving half or more of the soaked twine hanging over the outside edge of the barrel
(5) Using a match, light the exposed end of the twine
About 60 seconds later, experience a tremendous boom and fireball shooting from the burn barrel.
About 4 minutes later, watch the local cops cruise the neighborhood looking for the source. (this was right in town)