For years it was thought that the bread was possessed with hallucinogenic mould, when in fact it was LSD planted their by the pranksters at the CIA, who wanted to see what would happen as part of an experiment there were conducting into mind control at the height of the cold war.

What happened was, predictably enough, everyone went batshit crazy and out of the mind, five people died, and loads wound up in asylums.

An American investigative journalist has uncovered the evidence that suggests the US were responsible for the incident during his research for a book entitled A Terrible Mistake: The Murder of Frank Olson and the CIA’s Secret Cold War Experiments.

Photo: Getty.