The crushed bodies of a Central and South American insect, called the Cochineal, produces a natural red dye.
They are used for textiles, food-coloring, and cosmetics. Next time you see an ingredients list that includes carmine, cochineal extract or natural red 4, it comes from these bugs.
Killing with intent is where I draw the line. Bugs were very important in our journey to understand brains and thus deserve some respect as a cognitive being imo.