>>10450128>wait some hours after decanting to be safe>wanted to record some volcanic activity from the degassing>get a volcanic eruption instead>>10450137aerosol paint is mixed with propellant, when you decant cans instead of spraying them a lot of it is left behind in the paint leaving a volatile liquid that if disturbed can chain reaction into a violent burst.
what I'm guessing happened here is that the paint "settled" and the trapped gases couldn't escape even after several hours - and alas, the metal ball disturbed the evil creature.