The scariest thing we did as stupid teenagers was to use carbide, water, a fire cracker, and 5 gallon buckets.
We sprinkled a half can of carbide in a bucket with a hole drilled n the side with a fire cracker half way in, poured some water in, placed another bucket firmly into the lower bucket and lit the firecracker.
That was the loudest and most terrifying experience watching the upper 5 gallon bucket shoot above the tallest trees, probably 200 ft, then landing on the neighbors roof.