Our christmas tree used to be decorated with (among other things) red three-dimensional stars folded out of paper strips. Until we got our first cat. He loved nothing better than to attack those stars until they looked like dead spiders hanging on the tree. In two years, he managed to destroy all but three of the stars. My mother then replaced them with small wooden apples and gilded walnuts. He still attacked them, but they were pretty much indestructible.