When I was about 13, my mate Clive and I made a pipe bomb using a length of Raleigh Chopper frame tubing (large bore!) and about 1/2 lb of icing sugar/sodium nitrate mixture… the explosion caused quite a stir… the gas board were called but apart from a smashed 2" thick paving slab, there was no 'evidence… we maintained it was a ‘banger wrapped in sellotape’…
32 yrs later and Clive is still my mate… we’re building a Europa S2 race car and at the moment were putting the roll cage in… Hmmm - I think we might have some offcuts
Made loads of those, about 13 years old too.
Lucky to still be alive, no way did we realise how dangerous it was.
Best one was in a semi dried up river bed by a bridge.
Rush hour traffic queuing on the road above got well splattered with with mud and poo. Boy, I knew how to leg it in those days!