The Rock joins Greg James at the BBC Piazza to spread Christmas cheer by singing festive carols with unsuspecting members of the public. Dwayne performs 'Wish You a Merry Christmas,' 'Silent Night,' and 'Jingle Bells' with delighted strangers, surprises a Radio 1 DJ friend named Jerry with an emotional FaceTime to his nan, and hands out handmade Christmas gifts from Primark.