Dishes never get stacked. If they did, the world would come to an end. The gravitational pull of all those dishes in the sink would simply cause the fabric of space time to collapse on itself. There must be space between everything, air pockets to keep so much mass from being collected at one point. Water must be a mysterious anti-grav force, once you add water you can get all the dishes you want in the sink without worry. Or maybe soap lubricates the dishes enough to help resist their force on each other. And in the end, when they are put away, why does the cabinet not contain a black hole?