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Picture of How to Make a Pocket Sized Firecracker Cannon
This instructable shows how to make a firecracker cannon for less than $10. It is powered by a firecracker and it shoots a second firecracker. The firecracker that is shot explodes in midair.
DISCLAIMER: I am not responsible for anything that happens with your cannon. Build quality and material quality is not always the same. Some laws prohibit the use of firecrackers in certain areas. Check all state and local laws before using firecrackers.
 
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Step 1: Materials

Picture of Materials
Materials you will need are:
1 - 1/4"X2" iron pipe nipple
1 - 1/4"X1/4" coupler
1 - 1/4" air quick connect fitting
Firecrackers
All materials except the firecrackers can be found at a local hardware store.
Firecrackers can be found at a fireworks stand or store around the 4th of July, so around that time, STOCK UP.

Step 2: Assembly

Picture of Assembly
cannon 2.jpg
To assemble the cannon, screw the pipe nipple and quick connect together using the coupler.
(does not need to be very tight)

Step 3: Firing

Picture of Firing
To fire, unscrew the "breech" (quick connect fitting), place a firecracker (firecracker 1) in so that the fuse sticks out the small hole in the bumpy end, and place another firecracker (firecracker 2) in the barrel (iron pipe nipple).
Be sure to put firecracker 2 in fuse first.
To fire, light the end of the fuse in the end of the air quick connect fitting.
Bombs away!