In the second of a series about young people around the world as part of the BBC's Generation Next season, the BBC's Robin Lustig asks if teenage rebellion is a natural phenomenon or nurtured by Western pop culture.
The shop at the end of the street where I live in London has a sign on its door: "Only two children allowed in at a time."
The shop sells ice cream and canned drinks, and the shop-keeper knows that if crowds of children rush in together, some of his stock will disappear off his shelves into pockets and school-bags.
But if you think there is something new and frightening about children behaving badly, think again....