About halfway through "Hey Jude," there seems to be a "whoa" sound followed by somebody saying "fucking hell." Geoff Emerick, The Beatles' longtime sound engineer, wrote in his memoir Here, There, and Everywhere that it was Paul McCartney reacting to a botched note. Emerick claims that John Lennon insisted they leave the swear buried in the final mix. "Paul hit a clunker on the piano and said a naughty word," Lennon said. "Most people won't ever spot it ... but we'll know it's there."