Liverpool’s Magical Mystery Tour has long been one of the city’s most in-demand tourist attractions, with fans of The Beatles taken on a city-wide excursion to key locations in the Fab Four’s story. Now it comes with added star power: Sir Paul McCartney himself.

The band’s bassist made an unexpected cameo on a daily tour yesterday (July 20) when guests on the Magical Mystery bus spotted him at a set of traffic lights. After waving to fans in the serendipitous moment, they then received an added bonus when, after waving to fans, McCartney showed them that he was currently on a Facetime call with former bandmate Ringo Starr.

Speaking to the BBC, driver and tour guide Neal Morton said “it was surreal” to spot the musician while on the tour of the city.

“I had pulled up at the traffic lights on Hope Street when who should I see – Sir Paul with Ringo on Facetime”, he said. “He waved to us, and everybody took photos. The passengers could not believe it.”

McCartney was in town ahead of a presentation to actor Stephen Graham (Adolescence, The Irishman) with a companionship of the Liverpool Institute for Performing Arts (LIPA); McCartney is a co-founder of the school and often attends graduation ceremonies for students.

The unofficial tour, named after their 1967 LP, is a two-hour visit to the city’s locations that played a part in the band’s stories, visiting their childhood homes, Strawberry Fields, Penny Lane, and finishing at the Cavern Club, where the group played early shows.

It’s the latest team-up between McCartney and Starr after the pair duetted for the first time on the former’s latest album The Boys of Dungeon Lane, released in May.