The Beatles' songs are filled with hidden quirks and self-references including a convoluted series of clues that claimed that Paul McCartney was, in fact, dead the most famous example being the cover of 'Abbey Road' where he is walking barefoot, out of step and holding a cigarette. But the hit single 'Hey Jude' has an altogether different secret that could've killed its chart success if anyone realised at the time.
At about 2:58 of the song, McCartney can be heard to say, "Oh, ******* hell!", but Lennon liked it so much wanted to leave it in. Sound engineers Ken Scott and Geoff Emerick said: "'Paul hit a clunker on the piano and said a naughty word,' Lennon gleefully crowed, 'but I insisted we leave it in, buried just low enough so that it can barely be heard. Most people won't ever spot it but we'll know it's there.'"
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