I had first invented this simple device when I was but twelve years old and had a penchant for things that go boom. While presently taking a film class, this fond memory had percolated to the surface and I decided to revisit my mischievous childhood and my penchant.
BE ADVISED: This may be the teeniest bit unsafe and could result in some kind of harm to yourself, others, or objects, but mostly likely, you'll only make a mess. In any event: by reading this you relinquish all liability on my part in perpetuity for ever and ever!
Step 1: Gather ye stuffbuds while ye may.
Materials:1) Baking Soda (NOT baking powder you fool!!!)
2) Vinegar (I hear they put this in salads sometimes)
3) Toilet Paper (available in most bathrooms around the world)
4) An EMPTY 35mm film canister (I used fujifilm, hover on the pic to see why)
Step 3: Fill 'er up.
Step 4: Could you spare a square?
Step 5: Push it... push it good.
What follows is one of the more tricky and critical parts of the lesson. Push your finger in the TP ever so slightly to make a small concave surface below the opening of the canister. Be sure not to puncture the TP.