We upgraded the blender with thinner, harder 8mm blades and pushed it to the limit. First came 5,000 bouncy balls, rubber ducks, and even an Xbox console. Then we dropped in a 25 kg cast iron anvil.

The plan was simple: upgrade the blades and finally blend something properly. After bouncy balls, cymbals, helmets, and barrels, things escalated fast. Dropping a solid cast-iron anvil into the ...