I once managed to hit my neighbour's car, by ramming mine into it, whilst actually driving my dad's car.
As a kid I was walking my bike home because the brakes had broken, I was at the top of the big hill and one kid I didn't particularly like (he saw himself as a 12 year old tough guy), asked me for a go on the bike. I let him have a go. He was about three quarters of the way down the hill when the speed wobble of death got him.
I once accidentally smashed my mates teeth out by lobbing a brick in a game of war. I shouted grenade and lobbed it, he looked up to ask what I'd said and caught it in his chops. Knocked him senseless and toothless. We took an arm or a leg each, laid him at his mum's front door rang them bell and ran like fuckery.
I once stole a milk float and left it in somebody's garden, In a garden wall versus glass and fibre glass milkfloat clash, there are no winners.