Berglas conducted what he called "Nationwide Psychological Experiments", involving millions of listeners in their homes. This part of the show required listeners to write in to confirm their reactions. His weekly broadcasts included sensational stunts, including hanging a box over Regent Street, London for a whole week. It had been officially sealed by the Diplomatic Corps of the Admiralty and, when opened, it contained the passport of a randomly selected member of the studio audience, sitting in the Playhouse Theatre by the Embankment. The passport had disappeared just moments before.