!WARNING: I AM NOT RESPONSIBLE FOR YOU BEING DUMB. BE SAFE AND EXERCISE CAUTION
I will not show you how to make the stand for the cannon because I don't think most of you have a pair of skis lying around. I also dont believe you have a trumpet you can take the keys off of. I WILL encourage you to make your own stand. I Just happend to live near a junk yard full of this stuff.
Step 1: Finding a bullet casing (or two)
I say find a bullet casing or two because you might mess up and need to try again.
Step 2: Getting the gun powder
Step 3: Other things you will need
~ A drill
~ A 1/8 inch metal drill bit (or around that size)
~ A Toothpick
~ "strike anywhere matches"
~ Saftey glasses
~ Fuse (optional)