The street performer who took a swipe at an annoying man has told Nine News he's sorry. Vision Nine News/Richard Choeun/youtube A BUSKER captured punching a heckler in the face says he's not proud of what he did, but the man had crossed a boundary in antagonising him. Video of a Queensland busker David Mulder punching a heckler in the face has become a hit in more ways than one, going viral and racking up more than 400,000 views in a matter of hours. In the 35 second YouTube video, uploaded last night, Mr Mulder is shown doing his routine on Surfers Paradise shopping strip Cavill Ave, before being taunted by a male passer by. After being poked and prodded for 20 seconds, even receiving a saliva-soaked finger in his ear, Mr Mulder finally snaps and punches the young man in the face, to gasps from the crowd. Mr Mulder told Channel Nine that the man had "crossed a boundary" after he stuck a wet finger in his ear, but that he didn't condone violence and would apologise to the man if he had the chance. "It (punching someone) is not a thing I want to do or even profess I like doing," he said. He was in the wrong, but at the same time I was in the wrong for striking out. Violence is never vindicated.