A great many of the Beatles' songs have a climactic moment -- an opening of the floodgates when the song moves into another dimension. Examples include the high octave harmony near the end of "Good Day Sunshine," the high harmony during the last verse of "And Your Bird Can Sing," the bridges (or "middle eights," as they always called them, no matter how many bars there actually were
) in "Sexy Sadie," and definitely the fantastic half-time ending chorus of "Dear Prudence." There are obvious examples, like the halfway point in "Hey, Jude."
I meant for that to be about two sentences. Sheesh. Anyway, one of these instances is heard in "All My Loving," when Paul and Paul harmonize (thanks to overdubbing) during the last verse. Geroge handled the low part onstage. The high part really sends it through the roof. That's mainly why I like the song. The rest of it is great, but certain tunes are so burnt into my brain by now, it's difficult to hear them objectively!