Instructables
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

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 3: 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!