Paul McCartney died?

 The "Paul is Dead" conspiracy theory holds that Paul McCartney died in a car crash in 1966 and, to prevent the band from collapsing, he was secretly replaced by a look-alike named William Campbell.

Since 1969 until now, rumours circulated that The Beatles had left hidden messages confirming Paul's death: on "Strawberry Fields Forever" John Lennon was said to have murmured “I buried Paul” (although he actually said “cranberry sauce”), playing "Revolution 9" from "The White Album" backwards would play “Turn me on, dead man”, and on the cover of "Abbey Road" the four were depicted as a funeral procession, with Paul barefoot and holding a cigar in his right hand despite being left-handed, symbolising his role as “dead”. Even the cover of "Sgt. Pepper’s Lonely Hearts Club Band" was seen as a symbolic funeral.

 Despite the theory's widespread popularity, the Beatles always denied it and McCartney himself mocked it by titling an album "Paul Is Live" in 1993, turning this legend into one of the most famous and persistent myths in the history of rock.

Ps: Thanks to the person who recommended me write about this theory. :p