If you want to see a volcano getting agitated and threatening to erupt violently, then all you need to do is throw a bag of garbage into it.
That simple act can set off a chain reaction which sees a dried lake of lava turn from a placid sea of tranquility into a scary nightmare of bubbling rock.
I have to say I wouldn’t have volunteered to be the person throwing the garbage into the volcano. What if the momentum had taken the person with it?
I would also have run as soon as the crust disappeared to be replaced with spewing lava. Scrub that… to be honest I’d have never set foot on the volcano in the first place.