It's generous to treat someone to a meal.
Sue is making 4 servings of food for dinner, and the fridge is almost full.
Sue wants to not put any of the food in the fridge.
Sue shares the food with her family, giving the other 3 portions away.
Sue throws the rest of the leftovers out after making the food and doesn't share the food.
Sue's family has a nice dinner and compliment Sue on her cooking.
Sue's family expresses annoyance at Sue for not sharing, and get angry at her.