Daddy drives Matthew to kindergarten in his old green car. "See you this afternoon," says Daddy, as he kisses him goodbye. But Matthew stops him from leaving and asks, "What if, this afternoon, the old green car doesn't start"? Thus begins a series of what-ifs that Matthew poses in response to every one of Daddy's ideas about how he will manage to return and fetch him, each one more fantastic than the last: he'll come by tractor, by teddy bear, by the wings of birds, by a tiny boat, even by dragon! Finally, Daddy says he'll use his own two long legs, the ultimate reassurance that he'll come back for Matthew, no matter what!