It's rude not to save food for everyone
Kate, who lives at home with her parents, has been too busy with school assignments to fix up dinner.
Kate wants to order a pizza.
Kate orders an extra large pizza, enough to feed three and saves some for her parents.
Kate gets a medium pizza which is small enough for her to eat by herself.
Kate's parents get to rest when they get home because dinner is provided.
Kate's parents have to cook for themselves when they get home from work.