Then I recalled.
I'd listened to #BBC Radio Four's reading of George Orwell's 1984 on Saturday and the same technique was masterfully exposed by Orwell:
As a wage-slave deep in the bowels of Minitrue responsible for altering records of the past, Winston Smith recalled that the chocolate ration had just been cut to 20 grams but couldn't understand why the Proles swallowed the Party's propaganda that the chocolate ration had just been raised to 20 grams.