Pizza in film: the most useful prop in cinema
Give a character a pizza and you have told the audience four things without a line of dialogue: they are not cooking, they are probably not alone, it is late, and nobody here is doing well.
The stakeout meal
Pizza is what people eat when the plot will not let them leave. It appears in surveillance scenes, in newsrooms, in any room where a group is waiting for something. The box on the desk is shorthand for hours passing.
It also solves a practical problem. Actors can hold it, talk over it, and ignore it, which is more than can be said for a plate.
Class and comfort
Directors use pizza to place people. A shared box on the floor of an empty flat says one thing about a character's life. The same pizza eaten alone, standing at a counter, says another. Neither needs explaining.
In American cinema it carries a specific warmth, the food of childhood and of friends. That is why it turns up so often at the moment before something goes wrong: it lowers the guard of the scene.
The delivery scene
The doorbell is one of the few devices that can legitimately interrupt anything. A delivery brings a stranger into a closed space, resets the tension, and gives the film an excuse to move the camera. Thrillers and horror lean on it constantly, and the audience has learned to brace when the buzzer goes.
Do Do The Right Thing
The genre's high point remains a film built entirely around a pizzeria, where the shop is the neighbourhood, the wall of photographs is the argument, and the heat of the ovens is the plot. It is the rare case where pizza is not shorthand for anything. It is the subject.
Why it endures
Food in film is usually either a feast or a famine. Pizza is neither, which is what makes it useful. It is ordinary, it is shareable, and it photographs well under bad light. Cinema will keep ordering it.