You ever de-rail a train?
My dad used to find half spent fireworks after Bonfire Night and used to drop them down drains (opening them first) at the top of the hill of the estate he lived at as a teen and hear them bang down the hill.I think it also changes with generation.
I remember my dad saying how for fun he and his mates would head down the disused quarry a blow up pipe bombs they'd made.
We used to skive school, walk around the nearby golf course and get chased by angry golfers after we picked up the golf flags from the greens and threw them in the nearest stream. I realise now that's incredibly annoying but at the time it seemed like the funniest thing in the world
Twocking cars
Throwing water balloons through open windows was fun too.
we used to drop a teddy bear or doll etc dangling from a rope as people passed through.