It is apt to come irregularly, at some times and places not at all.

ECONOMIST: Third-world water and the private sector

Most teachers have a nearly impossible task, as they are told to deliver a curriculum in the course of a year and somehow manage 20 to 30 children, who are all in different places and have different learning needs at different times.

FORBES: Why Steve Jobs Would Have Loved Digital Learning

Meal times at home have all too often become places where members of the family pass by and spend little or no time in contact with each other.

BBC: NEWS | Programmes | Panorama | The system needs to be challenged

Initially there were humorous elements to this, however as the stories unravelled, the tone became darker and both gripping and uncomfortable in places - particularly when the audience is within a metre of him at all times.

BBC: Review: It's Like He's Knocking at Pulse Festival 2010