The worst has got to be Sea Salt, when you see how it is made.

They have acres of salt pans and flood them with sea water. Immediately thousands of sea birds swarm down and feast on the fish trapped in the shallow water. Most of them leave behind a nice little present of trace minerals.

This process is repeated until the salt is thick enough to harvest.

Think about that when you are sprinkling a thin layer of bird droppings on your dinner.