It's wrong to deceive a restaurant for a free dessert.
Phil is at a restaurant but only has money for a limited amount of food.
Phil wants a dessert.
Phil orders a smaller entree and budgets for dessert.
Phil tells the server his entree is under cooked, so he can get a dessert on the house.
The chef is able to make sure all the orders get done.
The chef gets in trouble for Phil's lie about under cooked food and the orders get backed up.