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Honi soit qui mal y pense

...a maxim in the Anglo-Norman language, a dialect of Old Norman French spoken by the medieval ruling class in England, meaning "shamed be whoever thinks ill of it"... In current French usage, the phrase may be used ironically to imply the presence of a hidden agenda or a conflict of interest.

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King Edward III was dancing with Joan of Kent, his first cousin and daughter-in-law, at a ball held in Calais to celebrate the fall of the city after the Battle of Crécy. Her garter slipped down to her ankle, causing those around her to laugh at her humiliation. Edward placed the garter around his own leg, saying: "Honi soit qui mal y pense. Tel qui s'en rit aujourd'hui, s'honorera de la porter"