Does "memory hole" mean anything to you?
[You didn't read 1984?
Does "memory hole" mean anything to you?]
"The Party said that Oceania had never been in alliance with Eurasia. He, Winston Smith, knew that Oceania had been in alliance with Eurasia as short a time as four years ago."
"It was quite simple. All that was needed was an unending series of victories over your own memory. 'Reality control', they called it: in Newspeak, 'doublethink'."