Hey Jude was originally written by Paul McCartney for John Lennon's son Julian (Hey Jules) to help him deal with his parents splitting up. But you already knew that (and even though there's a name change, it's barely an Easter egg). No, the reason I'm bringing up Hey Jude is because there's another hidden goodie in the song. So hidden, in fact, that even though it comes at a key point, in all the times you've listened to it you've probably never noticed it. Around the three minute mark (2:56 to be precise), just before the song turns into its "Na na na na na na naaaaaa" crescendo, you can hear someone semi-clearly exclaim "Oh fu*king hell". This is often attributed to Paul McCartney responding to mucking up a chord, although that's not really that likely (he's obviously the singer on the master take, and it sounds more like John anyway). Regardless of who said, there is a definite F-bomb in the song, something you can imagine the band were pretty happy to sneak into an otherwise radio-friendly tune. The version of the song used by Cirque du Soleil for their show Love cuts out this background expletive, and also altered the tone of the song going into the uproarious chorus - the lead-in lyric is "Let her into your heart" instead of the swear-covered "Let her under skin".