Saw this on the BBC news.

http://www.bbc.co.uk/news/uk-england-london-12773257

Do you think this is an isolated incident, or does it happen more
often an simply not get reported?

No doubt the parents of the kids responsible think that butter
wouldn't melt in their mouths and the sun shines out of their a***s.

Incidentally, I wonder if the BBCgot the location wrong, as the line
between Leyton and Stratford is in tunnel, apart from the short bit
between Leyton High Road and the tunnel entrance.