1: Go to Wal-mart and pick up a 6v Energizer lantern battery. Must be energizer.
2: Take a screwdriver and crack it open.
3: You’ll of course find 4 1.5v D cell batteries. Here’s where it gets awesome.
4: DO NOT OPEN THE D-Cells themselves or you’ll be showered with black goo.
Get the wires that connected the D’cells and seperate them where they connect.
5: Buy a paper bag without holes and several bullets from your local gun store. If it is NOT paper, you’re going to blow a gigantic hole in the ground and spend a few years in prison. MAKE SURE IT IS A BROWN PAPER BAG WITHOUT GOLDEN INK!!!
6: Remove the gunpowder from the bullets and place them in the paper bag.
7: Take the paper bag and put the 4 D-Cell batteries in it on top of the gunpowder.
8: Put the wires down in the gunpowder.
9: Take a long piece of string, go to the nearest unpopulated driveway/sidewalk and put one end in the gunpowder and the other near you. It must be at least 10 feet away.
10: Light the string and watch it burn to the gunpowder.
11: You’d think the gunpowder would explode, but it doesn’t because of the batteries!
You’ll see lots of grey foam come out of the bag. Believe it or not, this is the mixture of hot gunpowder, D-cell coverings and black goo.
Let the foaming finish.
12: Once the foaming has completely stopped, look inside the paper bag.
The only thing that will be left is the bag and — Oh my god! That’s right, 600 watch batteries that way EXACTLY the same as the D-cell batteries.

The science:
When you mix Gun Powder, the black goo and the alluminum from the D-cells, an unintended reaction occurs. It can only happen in a brown paper bag because of it’s adhesive properties. If a plastic bag is used, you’ll just make a gigantic explosion and probably kill yourself.

Several imperfect watch batteries are created in the foam. They won’t have text on them, they will look a little crude, but they’ll work! Note: 1 in every 10 of the watch batteries will be too crude to put in things. Just toss em.

Amazing!
Lets see the costs:
Bullets – $12
6v battery – $6
Paper bag – $0.10
String – $0.50
Lighter – $1
Total: $19.60
Tax: Obama pardoned
Total after tax: $19.60

Cost of 600 watch batteries from a store, not an awesome reaction:
Over $3000 without tax!
You saved: $2981.40

Cost of screwing up:
Hospital bills – $12,000
Bail money – $20,000
Total: $32,000

Don’t screw up.

Note: If you were actually about to go try that, you’ve probably already dumped 35 different brands of 6v batteries trying to find 32 AA’s.
First, if you actually manage to get the gunpowder out of the bullets without firing them, you’re lucky.
When you blow the gunpowder, it’s going to make a gigantic mushroom cloud and probably kill you.
Do not try this.
(I was required by the FBI to include that part.