MacGuffin

A MacGuffin is an object, goal, or piece of information that sets a plot in motion while remaining substantively irrelevant to it — the specific contents of the briefcase, the stolen plans, the letters of transit — where any equivalent prize would drive the same story.

The coinage is usually credited to the screenwriter Angus MacPhail, a friend and collaborator of Hitchcock's, with Hitchcock popularising it; the attribution is not firmly documented. The story Hitchcock told about the word, repeated in a published interview, is a joke rather than an etymology: two men are on a train, and one asks what the package on the luggage rack is. "That's a MacGuffin." What is a MacGuffin? An apparatus for trapping lions in the Scottish Highlands. But there are no lions in the Scottish Highlands. "Well then, that's no MacGuffin." The joke is that the object has no content at all — it is defined by nothing but its name, which is exactly the property the term describes. Treat it as illustration, not documented word history.

The design goal is audience indifference. A MacGuffin works because the characters' desire for it, not the object itself, generates tension; the audience should care about the chase and forget the prize once the story ends. This distinguishes it from a plot coupon, a related device where an object must be collected repeatedly — a key for each door, a fragment for each ritual — where the accumulation itself, not any one instance, structures the plot. A MacGuffin is singular and interchangeable; a plot coupon is serial and structural.

Both rely on the same trick as Chekhov's Gun: an object earns narrative weight from how the story treats it, independent of intrinsic content, which makes it a species of Diegesis — meaning assigned by framing rather than substance. Games often turn the same emptiness into literal collectible design, a Plausible Mechanism connecting narrative importance to a counter in the interface.