My four-year-old son is screaming. The noise is relentless, high-pitched - almost painful. It reverberates in my chest and sets every nerve on edge. He has been screaming for half an hour. He can barely keep it up but there is no way for him to stop. It is visceral.
It's a familiar sight now. Crowds of people - of all ages - glued to their phones on an unremarkable street corner in search of, you got it, a virtual animal. Few could have predicted the success of the latest craze to hit the UK. Or could they?
The internet lets us seek and share information, across borders and across vast distances, with unprecedented speed and ease. At the end of 2015, there were an estimated 3.2 billion internet users worldwide, up from 400 million in 2000.