Like the Satanic Panic noted below, another rumor I recall learning about in the 1980s (although its origins were earlier, of couse), was the notion that Paul McCartney, bassist and lead singer for the rock band The Beatles, had died and was replaced by a lookalike named Billy Shears from Ontario, Canada, who had been given additional plastic surgery and voice training so that he was indistinguisable from the original Paul. You could search for clues explaining this situation in the Beatles’ song lyrics and on the covers of their albums. A newly-made friend in junior high school expanded my universe by explaining some of them to me; I was no longer in grade school, for sure.
In honor of the fiftieth anniversary of the release of the Beatles’ seminal album Sgt. Pepper’s Lonely Hearts’ Club Band, here is an image of the gatefold picture, featuring all four Beatles in their Sgt. Pepper’s uniforms – and one of the clues:
The patch on Paul’s left shoulder, I’ve read in several places, reads “O.P.D.” – allegedly a Canadian abbreviation for “Officially Pronounced Dead.” But it in fact reads “O.P.P.” and is the shoulder flash of the Ontario Provincial Police.
The patch, according to Wikipedia, had been “given to John Lennon the day after their 1966 concert in Toronto by a summer student working in the garage of the OPP Headquarters (The group was being transferred to a police van for the trip to the airport).”
But the Ontario origins of the patch doubtlessly contributed to the notion that Paul’s replacement was from that particuar Canadian province.