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An erosion gully in Australia caused by rabbits, an unintended consequence of their introduction as game animals. In the social sciences, unintended consequences (sometimes unanticipated consequences or unforeseen consequences, more colloquially called knock-on effects) are outcomes of a purposeful action that are not intended or foreseen.
The first noted use of "serendipity" was by Horace Walpole on 28 January 1754. In a letter he wrote to his friend Horace Mann, Walpole explained an unexpected discovery he had made about a lost painting of Bianca Cappello by Giorgio Vasari [9] by reference to a Persian fairy tale, The Three Princes of Serendip.
Taleb's "black swan theory" (which differs from the earlier philosophical versions of the problem) refers only to statistically unexpected events of large magnitude and consequence and their dominant role in history. Such events, considered extreme outliers, collectively play vastly larger roles than regular occurrences.
The second one is also used to denote something unexpected/untimely as much as improbable. Hungarian – The two most often used expressions are majd ha piros hó esik ("when red snow falls"), and majd ha cigánygyerekek potyognak az égből ("When gypsy children are streaming from the sky").
Other research has identified circumstances that lead to the opposite of escalation of commitment, namely deescalation of commitment. This research explains the factors that influence whether escalation or deescalation of commitment is more likely to occur through the role of budgeting and mental accounting.
A tornado is an example of an extreme weather event. This tornado struck Anadarko, Oklahoma during a tornado outbreak in 1999.. Extreme weather includes unexpected, unusual, severe, or unseasonal weather; weather at the extremes of the historical distribution—the range that has been seen in the past.
Peripeteia / ˌ p ɛr ə p ɪ ˈ t eɪ. ə / (alternative Latin form: Peripetīa, ultimately from Greek: περιπέτεια) is a reversal of circumstances, or turning point. The term is primarily used with reference to works of literature; its anglicized form is peripety.
Natsuhiko Kyōgoku and Katsumi Tada posit that "nurari" is an onomatopoeic word meaning the state of slipperiness, and "hyon" similarly means a strange or unexpected circumstances, which is why "nurarihyon" was the name given to a yōkai that was slippery (nurarikurari) because it cannot be caught. [6]