We spent summers crawling inside a 50 gallon drum and rolling down the hill in it. Had some spectacular crashes. Great fun.
Had a mini-bike. Lots of crashes.
I used to walk on an old oil drum. Good for the balance, and don’t step on the rusted out areas and gash your foot.
The whole prisoner’s dilemma of the seesaw, you lose when the other kid jumps off and you slam into the ground, but your score sort of goes up the longer you keep going.
Scraping the powder out of caps to make a big bang.
When my father was twelve, he had a dog, a bicycle, and a rifle, and he counted himself as having everything a boy could need.