Corden chokes up as McCartney explains how a dream about his late mother led to the lyrics for "Let It Be".
Sir Paul then climbed into the passenger seat and the pair broke into a version of The Beatles' classic Drive My Car.
The video also saw the legend revisit his childhood home on 20 Fortlin Road, where he told the wonderful story of how he and John Lennon wrote She Loves You and played it for his father.
Nostalgia was certainly in the air as they came to St. Barnabas' Church, where McCartney reminisced about his choir boy days.
The guys then ended up at a pub where Paul surprised the locals by performing several songs for an emotional crowd.
As Europe’s Tariffs on U.S. Goods Take Effect, Trump Threatens Retaliation
Trump has also started a trade fight with China over Beijing's sharp-elbowed efforts to overtake US technological dominance. All told, the $450 billion in potential tariffs would cover almost 90 percent of goods China sends to the United States.
They visited the house that McCartney lived in from, he says, the ages of about 12 or 13 to 18 or 20, where Corden and McCartney did a rendition of "When I'm 64" with the current resident joining in. As McCartney walks around his old home, he tells the story of how his dad thought the song She Loves You should have the chorus of yes, yes, yes instead of the famous yeah, yeah, yeah. "I feel like it's more relevant now today maybe than it's ever been".
"Oh man, it got me emotional there", Corden said, wiping his eyes after the song. They cycled through "A Hard Day's Night", "Love Me Do" and "Back the USSR", as onlookers filled the pub. "If my grandad was here right now, he'd get an absolute kick out of this". Paul even makes James tear up as he shares the inspiration behind "Let It Be".
"Hi, I'm Paul McCartney", he said (needlessly) introducing himself to the homeowner.
"That's been one of the unusual things", McCartney, around the five-minute mark in the video up top, told Corden of the lasting impact of the Beatles' message.