To my shame now, but it was hilariously funny when we were 17, I used to drive 3.5 ltr Land-rovers for a job. We learned if you revved the engine, cut off the ignition at high revs, turn it back on before it stopped....booooom. unburned fuel apparently igniting.
I once burst wide-open a rear silencer doing it. The mechanics were ...surprised and a bit miffed apparently.
Same thing apparently, it was most effective in the late 50's early 60's pre motorways, when the more long distance runs left the yard in the early hours, imagine being laid in bed in that peaceful village in a deep slumber, when boom there seems to have been a bomb go off at 4am, rattling the roof tiles and shaking the windows.
on a separate note, I was once at a customers when a loud boom occurred, the walls shook and dust was falling from the ceiling, the lads in the warehouse were quite amused at my being startled, they said it was the scrap yard over the road, when cars went in the crusher, if they got a spark fuel vapour in the petrol tanks would go bang quite frequently, it happened alot
