Plot coupon
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A plot coupon, and the somewhat less-well-known plot voucher, are the names Nick Lowe gave to specimens of plot devices in his essay "The Well-Tempered Plot Device," which was published in Ansible in 1986. A plot coupon is an object whose possession or use is necessary in order to resolve the conflict upon which the plot hangs, when this necessity clearly springs from the arbitrary decision of the author to make it so necessary. (The name is derived from a joke: when the characters have collected enough plot coupons, they can trade them in for the denouement.) For example, if the main plot of a novel concerns an ancient artifact that was broken into several pieces, and which must now be collected, reassembled, and activated in order to defeat an alien threat, the separate pieces of the artifact are surely plot coupons.
Structurally, plot coupons can be viewed as the component parts of a divided and dispersed MacGuffin, the designated valuable object which motivates the characters and moves the story along. Plot coupons are fairly common in fantasy, mostly because they work well within an epic quest structure; but they occur in all the other varieties of fiction as well. Ilf and Petrov's The Twelve Chairs, the successive rounds of murder and detection in Agatha Christie's Ten Little Indians, and the multiple problems and solutions of the Chushingura story cycle all qualify for the label. As with every other workhorse plot device, a plot-coupon-based narrative can be dreary or compelling, depending on the skill of the author, although the term is seldom used to indicate writing that is approved of.
Also like every other workhorse plot device, plot coupons lend themselves to easy use by naive or unskilled writers. For example, one might imagine that defeating an alien threat would require one to organize a resistance, figure out the enemy's weaknesses, and draw up some kind of strategic plan. If instead the answer to this threat becomes "find these five components to construct the superweapon which will eliminate all the aliens in one fell swoop," the story can be more linear, the obstacles more arbitrary, the proportion of cause to effect less proportionate, the particular circumstances of the story less realistic, and the required research far less onerous.
Plot vouchers
"A Plot Voucher," says Lowe, "is one of those useful items that is presented to the hero at the start of his adventure with a purpose totally unspecified, that turns out at an arbitrary point later in the story to be exactly what's needed to get him out of a sticky and otherwise unresolvable situation." Clumsily used plot vouchers are a variety of deus ex machina, and have the potential to destroy the reader's suspension of disbelief by allowing the characters to overcome difficulties in an unlikely manner. One of the most common uses of a plot voucher is an item of some importance given to the protagonist by someone they respect, often with the instruction to keep the item near them at all times. Strikingly commonly, the protagonist is shot, but the bullet is deflected by the item they were given, even if the item itself could not feasibly stop a bullet (such as military dog tags, or some amulets).In the Twilight Zone episode "What You Need" (adapted from the short story by Lewis Padgett) the idea is central to the plot, with a man who is somehow able to see the future handing out items that will serve people's needs just in time—but with a twist at the end. The same idea is used in the movie Paycheck, where the protagonist is given a bag containing nineteen items, each of which will be used at some point to escape from pursuers or get past an obstacle. The justification for what would otherwise seem like an arbitrary setup is that the protagonist had access to a machine that let him see the future, and consequently knew what he would need.
Video games, especially adventure games, text adventures and computer role-playing games (which involve some amount of story) frequently use plot vouchers, as it makes for a convenient way to reconcile the linear nature of a story with the choice-based nature of a game. A plot voucher is one way to allow the author to dictate what must happen in order to proceed, while maintaining the illusion of choice.
In the first Final Fantasy game early on the player is given a Lute that shows no purpose throughout the entire game untill the last dungon here when played it will open the last bosses chamber. The plot voucher was parodied in an episode of the television program Family Guy, in which a character is given a banana and told that when it comes time to use it, he'll know; later on, he needs help in fighting an attacker, and so throws the banana at him, but it has no effect whatsoever.
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