Crowds gather to watch Sir Paul McCartney, on stage centre, and his band in Covent Garden, London, Friday, Oct. 18, 2013. The surprise gig lasted for 20 minutes during lunchtime following a similar appearance in New York last Friday. (Photo by Jonathan Short/Invision/AP)LONDON (AP) — People who lunch at Covent Garden are used to jugglers, mimes and street musicians vying for his or her attention — and a spare coin or two — but Friday's performer didn't hassle to go the hat.