Another reason to be careful filming in public... From The Daily Yomiuri Online, 3/11/13:
A man was beaten to death by a stranger filming a quarrel he was
involved in on a street in Konan Ward, Yokohama, at about 4:25 a.m.
Sunday, according to police.
Katsunari Maeda, 25, unemployed, was on his way home with a friend, a
22-year-old man. The police said Maeda's friend got in an argument with
the driver of a minivehicle.
A fourth individual nearby began filming the quarrel with his cell
phone and Maeda warned him to stop. The man then suddenly began hitting
Maeda, police said, punching him in the face and abdomen. Maeda was
taken to a hospital and confirmed dead.