Prompt engineering in 1965

  Every time he falls asleep, wake him up and bring him here.
  Fit the rhythm of the sound and vision to his brainwaves, it'll make for a much deeper response.

  ..
  'Listen to my voice.
  'Nothing but my voice.
  ..
  You have forgotten your name.
  'What is your name? '
  Now you will hear a voice say, "Now listen to me. "
  'You will always obey this voice. '
  'Now, listen to me. Listen to me.
  'You are here because you are a traitor.
  ..
  'Now, listen to me. Listen to me. '
  Now repeat after me,
  "Whenever I hear the voice say, 'Now, listen to me,' I will obey. "
  "When I hear the voice say, 'Now, listen to me,' I will obey. "
  You will wake up when I count five.
  You will forget what's happened to you but you will remember your name.
  One, two, three,
  four...
  five.

https://en.wikipedia.org/wiki/The_Ipcress_File_(film)