Don’t ever say that psychologists don’t like to get deeply involved with their work. In 1938, researchers were studying people being egotistical in conversation. So why not hide under their beds and spy on them?
In order not to introduce artifacts into the conversations, the investigators took special precautions to keep the subjects ignorant of the fact that their remarks were being recorded. To this end they concealed themselves under beds in students’ rooms where tea parties were being held, eavesdropped in dormitory smoking-rooms and dormitory wash-rooms, and listened to telephone conversations.