Back in the prehistoric days when I worked at EMI ('79-80) one of the team I was attached to used to experiment with connecting electronic components across the mains and seeing how spectacular a demise he could elicit. Metal can transistors were quite pretty, giving a small volcano effect as they boiled, rupturing the can as sparks flew out of the hole, but for sheer impact large, low voltage (12-35V) electrolytic capacitors took some beating. Big bang and a cloud of vile smoke which would drift through the facility, which was a typical 30-40's era factory, composed of individual "lab/workshops" which had no ceiling of their own, so really just solid dividers open to the glass roof.