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Known as the Dunning-Kruger effect, this phenomenon was first reported by two Cornell University psychologists who found that people overestimate their abilities in all sorts of areas, including sense of humor, grammar and reasoning skills. The effect is most pronounced among people who have the least skill; for example, those with a test score in the 12th percentile would, on average, estimate themselves to be in the 62nd percentile. This explains, among other things, a large percentage of American Idol auditions.