A cameo role or cameo appearance (often shortened to just cameo) is a brief appearance of a known person in a work of the performing arts, such as plays, movies, video games and television. Such a role does not have to be an actor: short appearances by movie directors, politicians, athletes, and other celebrities are common.
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Film director Alfred Hitchcock boards the train while lead character Haines gets off, at the beginning of Strangers on a Train, 1951
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