LONDON (Reuters) – Canadian pop megastar Justin Bieber was once filmed lunging and shouting abuse at a photographer on Friday throughout an ill-fated keep in London which has long past from bad to worse after he collapsed on stage the day before. The altercation, caught on digital camera and featured on fashionable celebrity information websites including TMZ, showed the 19-year-old get out of a van, attempt to move against the unnamed member of the paparazzi and threaten him the usage of several swear phrases. …