The actor described how he was surrounded by a gang of youths who proceeded to give him a slow, sarcastic, handclap which continued for five minutes before the former Friends star lost his cool with them.

'I lost it,' he told us, 'and just shouted at the to shut the f%$k up' but they just continued, if anything they started to clap more slowly and more sarcastically, whilst throughout they laughed and smiled maniacally. It was bloody weird I can tell you.'

The 30 something multi-millionaire left the popular sandwich restaurant and walked home with the youths following him for several miles before they eventually got bored and walked off.

Earlier this year former Buffy star Sarah Michelle Gellar was also Happy Clapped by a group of youths who spotted her coming out of a store on Rodeo Drive. She described the ordeal as 'frightening'.

Videos of the incident, captured on mobile phones by the slappers have been circulating on the Internet for months, and show a visibly shaken Gellar trying to understand what was happening.