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I don't think these rumours are lies exactly. Just human nature. I think they circulate like a lot of urban myths because a lot of people edit the story just a little. Instead of saying "I met someone, who knew someone' people tend to shorten the link to just one person between them and the incident. Add a little exaggeration each time, and you soon have the story. Like the constantly circulating myths of a stranger in a supermarket warning someone of some danger after being done a small favour. Or how Penn and Teller recreated the Indian rope trick - I think, it may be just a rumour too.