Hi, Pizza Man!

It all begins with a simple question posed by a patient mother when her impatient toddler shouts, 'I'm hungry!' 'What will you say when the doorbell rings and we open the door?' asks Mom. 'Hi, Pizza Man!' replies the thoughtful child. . . .(But) what if it's a pizza woman?. . . a pizza kitty?. . . a pizza duck?. . . The book has a wonderfully satisfying roundness that comes full circle when the doorbell finally rings.
—The Horn Book.