WHY

The video uses a surprising and counter-intuitive demonstration of a common object (a spark plug) being used as a weapon, creating a strong 'wow' factor and curiosity that drives engagement.

This video explains why motorcycle riders carry broken spark plug ceramic pieces, referred to as 'ninja rocks.' The ceramic shatters into sharp microscopic fragments that can concentrate energy onto a single point, allowing them to break tempered glass for self-defense.

Spark plug: ACTS - it is shown being broken and its ceramic pieces are discussed as a tool. Removing it would change the video's demonstration. Ninja Rocks: APPEARS - this is a nickname for the ceramic pieces of a spark plug, not a separate product.