Not petrol but…
As a teenager living on the windswept ayrshire coast building bonfires on the beach made for good entertainment of a summer evening.
We used to look around the shore for “interesting” stuff to put on the fire – old aerosol cans etc. One night we found a butane tank. Confident that it was pretty much empty and it might make a bit of a bang at most we stuck it on the bonfire but retired to a “safe” distance just in case.
The resulting explosion blew the bonfire out and scattered hot embers all over the beach. How we avoided getting burnt as fire rained from the sky I’ll never know. We promptly scarpered the distant sounds of sirens in our ears.
After that sticking stuff on the bonfire didn’t seem that interesting anymore
Guess it wasn’t that empty