Ridi, Pagliaccio comes from Ruggero Leoncavallo's 1892 opera Pagliacci, sung by Canio, a clown who must perform after discovering his wife's betrayal. The line, meaning laugh, clown, closes the celebrated aria Vesti la giubba, which has become one of opera's most recognisable moments. Beyond the stage, it appears in films, cartoons and online edits as shorthand for hidden sorrow behind a performance. Its fame endures because the contrast between laughter and grief is immediate, even for listeners who have never seen the opera.