Originally Posted by Jel

"Happy slapping is a fad originating in the UK in which one or more people attack a victim for the purpose of recording the assault (commonly with a camera phone or a smartphone). Though the term usually refers to relatively minor acts of violence such as hitting or slapping the victim, more serious crimes such as the manslaughter of a pensioner, rape, and sexual assault have also been classified as "happy slapping" by the media"

and gotta love rough justice: