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Boffo (Concept)
From Discworld & Pratchett Wiki
Boffo the abstract noun. Boffo is a kind of headology, described by Pratchett as "the power of expectations"; the strength one gains from behaving exactly as someone expects you to. Boffo is introduced by the witch Eumenides Treason in Wintersmith as a means by which she ensures people take her seriously.
It gets its name from the Boffo Novelty and Joke Shop, no. 4, Tenth Egg Street, Ankh-Morpork, from which Miss Treason purchases most of her interior decorating supplies, the better to ensure that when people come calling they don't see what is really there (a tired, blind 111-year-old woman), but what they expect (a venerable, terrifying 113-year-old witch).
As a concept, Boffo is hardly unique to the Discworld: Roundworld bling such as Rolex watches, Armani suits and the crowns of kings is all Boffo, only more expensive.
