When I was a pre-spotty person, I lived in Malaya (as was) and Singapore. Various Chinese festivities are enlivened by pyrotechnic devices, some of them amazingly elaborate, but many consisting simply of chains of paired red=paper=wrapped bangers of various kinds.
Once the locals had had their fun, we would descend on the swathes of shredded red paper and comb through them. There were always unsploded splodies, and we would gather them for fun and hearing loss (I found out quite early why fuses are longer than the one I lit and then threw not quite far enough away so avoid ringing ears)
One of the potentially lethal things we did was to set the little bastards off in enclosed spaces. My own first attempt was to put a small plastic bucket over one, with the fuse sticking out under its rim. The resulting explosion sent the bucket some ten feet into the air. Our ultimate experiment, until my fayher found us at it and took away our implement, involved a broken toy go-cart.
If you G**gle Weyhill Close in Singapore, my old house is stull there (on the north side of the close, a wire mesh gate with a red post box on it and two plastic waste bins outside it; my bedroom was the first floor balcony you can see) you may note there is a steep little slope down from the lane to the main road. We spent a lot of time eroding the grass by sliding down there on sheets of cardboard, but one oik of the neighbourhood obtained said four-wheeled device. He used it on the slope, naturally, and managed to snap it in half. I believe it resulted in a trip to the Alexandra Hospital. I would be there later for one of my intersex surgeries.
We recovered the remnants of the go-cart, saw that we had two open ends of tube mounted on two wheels, and the obvious idea of mobile artillery came to us. Get a ball of stony mud ready. wedge it in on top of a banger with the fuse protruding, and train the artillery on one of the large sheets of cardboard placed before a tree. Light fuse. Do not retire.
I am astonished that I managed to retain all digits and appendages.