I used to put roll caps into a clear plastic pill bottle, cap it, and set them off with a magnifying glass in the sun.
Genius like yours would have fit right in with my group of friends. We did everything we could think of to creatively blow stuff up. :) We were lucky kids to have a very large woods in our neighborhood. During my childhood there were always woods either behind our house or across the street. No kid should be without woods to play in.
Our pinnacle may have been the drilled out CO2 cartridge stuffed with match heads and placed in a steel pipe - which we called our bazooka! :) This was back in the day when CO2 cartridges were made of steel, and could (sometimes) withstand the pressure generated when the match heads explode.
Forty years later my friends and I still have all of our fingers. Amazing!