I think the teenagers are very bored, they don't know what they have to do and decide to kill time doing whatever exciting, but they really don't be concient of what they are joking with. The have quiet posibilities of die.Somebody has to explain to them that they can have funny doing better things, for example, sports.
When I was a teenager I liked to ride my bike and go to the beach in the summer, I think we didn't do the same things that they do now, it was much more difficult to get drugs, otherwise, now it's very easy, specially in the night clubs.