"I had to text him back and was like, 'No dude, that's not what we meant.' What we were trying to say was it was uncomfortable to sit in a vehicle and try to sing our own songs".
Sir Paul McCartney climbed in next to Corden, revealed tidbits about himself and the Beatles, and crooned show-themed songs such as "Penny Lane" (the actual road they were driving on) and "Drive My Car", per USA Today.
As homecoming gigs for one of the world's biggest rock stars go, it was fairly low key: a small band on a slightly bigger stage in a local pub.
Corden labelled it "the most lovely story" he has ever heard, before the pair perform a version of it.
After the unusually heartfelt moment, the segment continued on in a lighter mood, as the host and the music icon drove around Liverpool visiting all the places that played a significant role in the history of The Beatles.
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"Here, this is where me and John used to come to rehearse or write", he explained. "Couldn't you sing she loves you yes, yes, yes?' And we were like, no", said McCartney.
We never thought we'd get emotional watching an episode of "Carpool Karaoke", but here we are.
In between songs, McCartney autographs the Penny Lane wall and visits his childhood home.
Within seconds, the small crowd was on its feet, and more poured through the door as word spread, as he performed A Hard Day's Night, Ob-La-Di, Ob-La-Da, Love Me Do, Back in the USSR and Hey Jude. The only problem is that Grohl isn't much of a piano player, and the famously leftie McCartney only had left handed guitars laying about, which were no use to the right-handed Foo Fighter. "We expected it to last 10 years but it keeps going on and on and on and it keeps being relevant".