I used to work part-time as a Youth-Worker at a Youth-Centre on a school campus. It was quite a regular occurrence, when checking the building was clear and secure at the end of the evening, to find one or more of the boys’ lavatories blocked by having several toilet rolls shoved down it, and a pile of human sh*t left on the top.

You have to remind yourself, under those circumstances, that it was just one kid out of the fifty or so who had come through the door that evening. But it’s still very depressing.