Check out this product and make sure to read the reviews. They're hysterical!
http://www.amazon.com/gp/product/B000796XXM/ref=cm_cr_pr_product_topMy favorite reviews are:
"I purchased this product because I wanted to make a 5 megaton bomb to impress my neighbors at our fourth of July barbecue. Unfortunately, when all was said and done, I was embarrassed when the yield was less than 500 kt. No birds on fire, no boiling rivers, nothing. I want my money back!"
"I shaved some of this into a EPA water sample, now they've declared the whole neighborhood a Superfund site! Hello Government buyout! We're moving to Mississippi!!!"