Have you ever been at a bridge event and heard someone exclaim: ‘He Grosvenor’d me!’ They are referring to a Grosvenor Coup. Normally, they’ve just realised — too late — that an opponent played an idiotic card in defence that could have enabled them to make their contract. But because it didn’t occur to them that the opponent would make such a blunder, they got a false picture of the hand and chose a line of play that failed.