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A switcheroo is a sudden unexpected variation or reversal that is often associated with a joke (sometimes "the old switcheroo"). It is colloquially used in reference to an act of intentionally or unintentionally swapping two objects.
Another example comes from the film The Aristocrats, wherein Wendy Liebman pulls "the old switcheroo". Whereas the joke normally is narrated as a vulgar series of actions followed by the clean punch line, Liebman narrates a very aristocratic series of actions followed by a very vulgar punch line.
In his book, Gödel, Escher, Bach, Douglas Hofstadter names one of the rules in his version of Propositional calculus the Switcheroo Rule, apparently in honour of an Albanian railroad engineer, name Q.q.Switcheroo, who "worked in logic on the siding". This is in reality the disjunctive syllogism.
One of the most famous examples of a switcheroo is the feud between Bugs Bunny and Daffy Duck. Daffy often tries to find ways of getting Elmer Fudd to shoot Bugs, but Bugs will somehow change the situation that ends with Daffy getting shot.