That's funeeeee.
Makesme wonder if they actually knew it was propane in the tank, or had someone filled an odd tank with gas. You would think they would be inclined to actually use any gas they got.
And to be honest, it makes me wonder if it was gas at all. Surely gas under pressure would try to escape all at once. That looked more like a liquid to me.
I reckon someone had filled an air tank with petrol, or some such stuff, and it had got warm in the sun, and presurised.