Granfalloon

A granfalloon, in the fictional religion of Bokononism (created by Kurt Vonnegut in his 1963 novel Cat's Cradle), is defined as a "false karass". That is, it is a group of people who affect a shared identity or purpose, but whose mutual association is meaningless.
As quoted in And So It Goes: Kurt Vonnegut: A Life (2011) by Charles J. Shields, Vonnegut writes in his introduction to his book Wampeters, Foma and Granfalloons (1974) that a "granfalloon is a proud and meaningless collection of human beings"; Shields also comments that in the same book, Vonnegut later cites the demonym of 'Hoosiers' as "one of [Vonnegut's] favorite examples" of what the term embodies. Another example of a granfalloon given in Cat's Cradle is 'alumni of Cornell University'. Kurt Vonnegut himself was born in Indiana and attended Cornell University.
The most commonly purported granfalloons are associations and societies based on a shared but ultimately fabricated premise. Examples from Cat's Cradle include: "the Communist Party, the Daughters of the American Revolution, the General Electric Company—and any nation, anytime, anywhere." A more general and oft-cited quote defines a granfalloon as "a proud and meaningless association of human beings." Other examples of granfalloons cited in the novel include Hoosiers, which included the fictional narrator (and Vonnegut himself); and Cornellians (those who attended Cornell University)—which also included the fictional narrator and Vonnegut himself.
In the English translations of the several entries of the popular video game series Castlevania, the name Granfalloon has been used as an alternate name to represent the Judeo-Christian demon Legion. Particularly noted in Castlevania: Symphony of the Night as a mass of living corpses whom the protagonist Alucard, son of Dracula, fights against as one of the game's many bosses. Series director Koji Igarashi (a.k.a. Iga) is a noted fan of Kurt Vonnegut and selected this alternate name for Legion, as he believed the Vonnegut concept to be a perfect representation for that boss.
The granfalloon technique is a method of persuasion in which individuals are encouraged to identify with a particular granfalloon or social group. The pressure to identify with a group is meant as a method of securing the individual's loyalty and commitment through adoption of the group's symbols, rituals, and beliefs.
In social psychology, the concept stems from research by the Polish social psychologist Henri Tajfel, whose findings have come to be known as the minimal group paradigm. In his research, Tajfel found that strangers would form groups on the basis of completely inconsequential criteria.
In one study, Tajfel subjects were asked to watch a coin toss. They were then designated to a particular group based on whether the coin landed on heads or tails. The subjects placed in groups based on such meaningless associations between them have consistently been found to "act as if those sharing the meaningless labels were kin or close friends."
Researchers since Tajfel have made strides into unraveling the mystery behind this phenomenon. Today it is broken down into two basic psychological processes, one cognitive and one motivational.
First, knowing that one is a part of this group is used to make sense of the world. When one associates with a particular group, those in the group focus on the similarities between the members. However, for people not in the group, or "outsiders," differences are focused upon and often exaggerated. A problem with the granfalloon is that it often leads to in-group, out-group bias.
Second, social groups provide a source of self-esteem and pride, a form of reverse Groucho Marxism as in his famous remark "I don't care to belong to any club that would have me as a member."
The imagined communities of Benedict Anderson form a similar concept. Therapist Grant Devilly considers that granfalloons are one explanation for how pseudoscientific topics are promoted.