For me it is the fact that our blood contains iron. I earlier used to believe the word stood for some ‘organic element’ since I couldn’t accept we had metal flowing through our supposed carbon-based bodies, till I realized that is where the taste and smell of blood comes from.
You can kind of visualize it as wire EDM manufacturing. Although not a fully accurate depiction, but it fractures the connection between the two sides.
That analogy relies on the reader having any idea what wire EDM manufacturing is. ;) Not exactly an everyday topic.