Not sure if it was a 'prank' or not - but back in secondary school a mate got a copy of the Jolly Roger Cookbook for his Amiga; we tried a lot of stuff from that, often with no success as it was mainly American stuff. But we did try making napalm
God, the whole thing seems so daft now - we managed to get two plastic jerry cans of fuel (one petrol and the other diesel), and the 'recipe' called for mixing it with egg whites or something daft like that - we were in a dark field with a lit esbit stove, trying to mix two types of fuel whilst trying (and failing) to separate yolks and whites
Ended up sacking it off, tried to light the diesel can, gave up and took the petrol for some fun.
I retrospect we were right little ***** always burning stuff, playing in a bunch of derelict buildings in Swindon (now a big retail park), often buying massive cans of hairspray to then play Street fighter with (setting our hands and arms on fire pretentinf to do a hadoken) - then bunging it all in a metal bin to blow up. Had the fire brigade and police out the the site numerous times... we always legged it. Set fire to huge piles of polystyrene once, my god was that a toxic mistake!!
We trespassed on an old air base with our G10 BB guns, having shootouts - daft as they shot metal BBs, and I got hit above the eye once...
I moved house in the latter years of secondary, and found a load of nail gun charges in the coal shed out the back - promptly taking them into school, so we could use the gun powder.... think I even took petrol in once, then binned it as a mate said it would eat through the plastic bottle!
Then there was the stone aminals - we always nicked those from gardens, and (stupidly) put them in a main road and watched as cars ploughed into them, one took a bumper off on one occasion. One of the lads thought it would be funny to return a smashed cat statue after one such indicent, and we poured Warhammer blood Angel paint all over it (and the houses step) before knocking and running.
Ahhhh Swindon.