Paul McCartney and Ringo Starr came together to promote The Beatles: Rock Band video game.
The two surviving Beatles, along with Yoko Ono and Olivia Harrison, appeared at Microsoft's Electronic Entertainment Expo presentation at the University of Southern California's Galen Centre.
Ono and Harrison were briefly introduced - but didn't say anything - before McCartney and Starr appeared on stage to banter about the upcoming game.
"Whoever thought we'd end up as androids?" joked McCartney.
In the music game developed by Harmonix and published by MTV Games, players will be able to follow - and perform as - members of the legendary music group, beginning with their early days in 1963 Liverpool through their final rooftop performance.
Unlike its Rock Band predecessor, The Beatles edition will feature three-part vocal harmonies.
Forty-five Beatles songs will be available on the game's disc when The Beatles: Rock Band is released on September 9, including I Am The Walrus, Back In The USSR, Here Comes The Sun, Get Back, and I Feel Fine.
Microsoft said All You Need Is Love will be released for download on the Xbox 360, with proceeds going to Doctors Without Borders.