Jim,
"do you think it is a coincidence that the trouble invariably happens at this time of the year,"

The phrase 'recreational rioting' was made in Belfast, to describe the traditional outbreak of street disturbances once the summer school holidays begin.

After a third consecutive night of trouble, Fr Donegan said: "I pulled stones out of the hands of children.

"It was a bit like a Euro Disney theme park for rioting. It was ludicrous."

Most of the young rioters were simply bored kids looking for some excitement in an inner city area where they complain of having nothing else to do.
http://www.bbc.co.uk/news/uk-northern+ireland-10642007