Paul McCartney and his wife Nancy Shevell were in New Orleans for Super Bowl Sunday, and over the weekend he found himself on a street car with fellow revelers. The former Beatle used the time to serenade those around him with hits from the Fab Four's catalog, but most thought he was a lowly busker who would soon ask for tips.

The London Mirror reports that those on the street car ignored McCartney as he worked through hits like 'A Hard Day's Night.' “He started to sing directly to my friend Evelyn," says Louisiana resident Robert Senft. "We realized it was Sir Paul McCartney and were in shock.”

Within moments the rest of the street car was taking photos of McCartney with Shevell. "It was a once in a lifetime experience,” Senft tells the Mirror.

The 70-year-old singer was allegedly in New Orleans to party with Justin Timberlake and company during the big game. It's not immediately clear if McCartney was cheering for the 49ers or Ravens. Of course he performed at halftime during Super Bowl XXXIX in 2005.